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Bibliografías temáticas / Celestial orientation

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Literatura académica sobre el tema "Celestial orientation"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Celestial orientation"

1

Zolotareva, A. D. y N. S. Chernetsov. "Celestial Orientation in Birds". Biology Bulletin 48, n.º 9 (diciembre de 2021): 1503–12. http://dx.doi.org/10.1134/s1062359021090259.

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UGOLINI, A. y S. FELICIONI. "Celestial orientation in Gryllotalpa gryllotalpa". Physiological Entomology 16, n.º 3 (septiembre de 1991): 355–60. http://dx.doi.org/10.1111/j.1365-3032.1991.tb00573.x.

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Wiltschko, W. y R. Wiltschko. "Magnetic orientation and celestial cues in migratory orientation". Experientia 46, n.º 4 (abril de 1990): 342–52. http://dx.doi.org/10.1007/bf01952167.

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Hakim, Lukmanul y Yudhiakto Pramudya. "Pengukuran Ketepatan Alignment Sistem Penjejak Gerak Benda Langit dengan Metode Drift Berbantuan Tracker". JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) 4, n.º 2 (28 de noviembre de 2020): 72–76. http://dx.doi.org/10.30599/jipfri.v4i2.767.

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The simulation of the drift method application using a celestial body tracker has been done. Experiments were carried out by recording the movement of a celestial body tracker with variation orientation of polar angle and azimuth from the true south and polar angle a particular location. The variation is between -2° to +2°. It was found that the greater the difference in the mounting orientation from the true orientation, the greater the shift in altitude and azimuth of the celestial object’s path.

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el Jundi, Basil, Eric J. Warrant, Marcus J. Byrne, Lana Khaldy, Emily Baird, Jochen Smolka y Marie Dacke. "Neural coding underlying the cue preference for celestial orientation". Proceedings of the National Academy of Sciences 112, n.º 36 (24 de agosto de 2015): 11395–400. http://dx.doi.org/10.1073/pnas.1501272112.

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Diurnal and nocturnal African dung beetles use celestial cues, such as the sun, the moon, and the polarization pattern, to roll dung balls along straight paths across the savanna. Although nocturnal beetles move in the same manner through the same environment as their diurnal relatives, they do so when light conditions are at least 1 million-fold dimmer. Here, we show, for the first time to our knowledge, that the celestial cue preference differs between nocturnal and diurnal beetles in a manner that reflects their contrasting visual ecologies. We also demonstrate how these cue preferences are reflected in the activity of compass neurons in the brain. At night, polarized skylight is the dominant orientation cue for nocturnal beetles. However, if we coerce them to roll during the day, they instead use a celestial body (the sun) as their primary orientation cue. Diurnal beetles, however, persist in using a celestial body for their compass, day or night. Compass neurons in the central complex of diurnal beetles are tuned only to the sun, whereas the same neurons in the nocturnal species switch exclusively to polarized light at lunar light intensities. Thus, these neurons encode the preferences for particular celestial cues and alter their weighting according to ambient light conditions. This flexible encoding of celestial cue preferences relative to the prevailing visual scenery provides a simple, yet effective, mechanism for enabling visual orientation at any light intensity.

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Arias, E. F., J. F. Lestrade y M. Feissel. "Relative orientation of VLBI celestial reference frames". Symposium - International Astronomical Union 128 (1988): 61–66. http://dx.doi.org/10.1017/s0074180900119278.

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Several series of celestial reference frames have been produced during the past few years as part of VLBI geodynamic programs. They consist in coordinates of 20 to 150 extragalactic radio sources with a precision at the level of 0.001″. The relative orientations of these frames and the evolution of each series of catalogs are studied.

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Palavalli-Nettimi, R. y A. Narendra. "Does size affect orientation using celestial cues?" Insectes Sociaux 65, n.º 4 (26 de junio de 2018): 657–62. http://dx.doi.org/10.1007/s00040-018-0640-9.

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el Jundi, Basil, James J. Foster, Lana Khaldy, Marcus J. Byrne, Marie Dacke y Emily Baird. "A Snapshot-Based Mechanism for Celestial Orientation". Current Biology 26, n.º 11 (junio de 2016): 1456–62. http://dx.doi.org/10.1016/j.cub.2016.03.030.

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Wiltschko, Wolfgang y Roswitha Wiltschko. "Magnetic versus celestial orientation in migrating birds". Trends in Ecology & Evolution 3, n.º 1 (enero de 1988): 13–15. http://dx.doi.org/10.1016/0169-5347(88)90076-6.

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Dacke, M., Basil el Jundi, Jochen Smolka, Marcus Byrne y Emily Baird. "The role of the sun in the celestial compass of dung beetles". Philosophical Transactions of the Royal Society B: Biological Sciences 369, n.º 1636 (19 de febrero de 2014): 20130036. http://dx.doi.org/10.1098/rstb.2013.0036.

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Recent research has focused on the different types of compass cues available to ball-rolling beetles for orientation, but little is known about the relative precision of each of these cues and how they interact. In this study, we find that the absolute orientation error of the celestial compass of the day-active dung beetle Scarabaeus lamarcki doubles from 16° at solar elevations below 60° to an error of 29° at solar elevations above 75°. As ball-rolling dung beetles rely solely on celestial compass cues for their orientation, these insects experience a large decrease in orientation precision towards the middle of the day. We also find that in the compass system of dung beetles, the solar cues and the skylight cues are used together and share the control of orientation behaviour. Finally, we demonstrate that the relative influence of the azimuthal position of the sun for straight-line orientation decreases as the sun draws closer to the horizon. In conclusion, ball-rolling dung beetles possess a dynamic celestial compass system in which the orientation precision and the relative influence of the solar compass cues change over the course of the day.

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Más fuentes

Tesis sobre el tema "Celestial orientation"

1

Prendergast, Kate. "The celestial orientation of monuments and social practice in Neolithic Britain". Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312924.

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Gudmundson, Karl. "Ground Based Attitude Determination Using a SWIR Star Tracker". Thesis, Linköpings universitet, Reglerteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-158129.

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This work investigates the possibility of obtaining attitude estimates by capturing images of stars using a SWIR camera. Today, many autonomous systems rely on the measurements from a GPS to obtain accurate position and attitude estimates. However, the GPS signals are vulnerable to both jamming and spoofing, making any system reliant on only GPS signals insecure. To make the navigation systems more robust, other sensors can be added to acquire a multisensor system. One of these sensors might be a ground based SWIR star camera that is able to provide accurate attitude estimates. To investigate if this is possible, an experimental setup with a SWIR camera was placed at the office of FOI Linköping, where the camera in a rigid position has captured images of the sky. The SWIR camera possesses several advantages over a camera operating in the visual spectrum. For example, the background radiation is weaker and the transmission through the atmosphere is higher in certain wavelength bands. The images captured by the SWIR camera was provided to a star tracker software that has been developed. The star tracker software contains algorithms to detect stars, position them in the image at subpixel accuracy, match the stars to a star database and finally output an attitude based on the stars from the image and the identified stars in the database. To further improve the attitude estimates, an MEKF was applied. The results show that attitude estimates could be obtained consistently from late evenings to early mornings, when the sky was dark. However, this required that the weather conditions were good, i.e., a limited amount of clouds. When more clouds were present, no attitude estimates could be provided for a majority of the night. The SWIR camera was also compared to a camera operating in the visual spectrum when clouds were present, to see if the results were any different. With the camera settings applied in this work, the two cameras seemed to perform equally. The accuracy of the estimated attitudes is hard to validate, since no true attitude is available. However, the variance of the estimates was low, and the major differences in the attitude estimates over a night's measurements seemed to be a drift present in all angles. The maximum estimated error in declination during a night's measurements varied from about 40 to 60 arc seconds, depending on the data set. The maximum estimated error in right ascension varied between 200 and 2000 arc seconds, and the same metric in the roll estimate were about 100 to 2500 arc seconds. The reason for the drifts is assumed to be atmospheric effects not being accounted for, and astronomical effects moving the direction of the rotation axis of the earth, creating errors in the star positions given in the database.

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3

Ciofini, Alice. "Interaction among celestial orienting factors and their functioning in supralittoral crustaceans". Doctoral thesis, 2018. http://hdl.handle.net/2158/1120833.

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Behavioural investigations conducted since the Fifties have revealed that the amphipod Talitrus saltator can rely on both the sun and the moon as compass cues in its zonal recovery; recently, evidence for discrete endogenous oscillators underlying its time-compensated solar and lunar orientation has been also given. T. saltator is the first species shown able to obtain compass information by using only the skylight intensity gradient. Instead, it does not rely on the celestial polarization pattern despite its sensitivity to polarized light. Although discrete receptors detecting UV-blue and green light have been identified within its compound eye, neither the capability of this species to use the spectral pattern of the sky nor the regionalisation of its visual pigments (eventually indicating the existence of a DRA) has been investigated. Furthermore, investigations on the structure of its compound eye conducted so far are quite scarce despite the importance of the vision in the perception of orienting stimuli. Evidence for solar and lunar orientation has been provided also in the isopod Tylos europaeus. However, as opposed to its ability to orientate to the sun, its moon compass-based orientation has not been confirmed. The aims of this work are: 1) to deepen our knowledges on the use of the celestial gradients by T. saltator, 2) to evaluate the regionalization of its visual capabilities, 3) to assess the optical and functional structure of its compound eye, 4) to investigate the anatomical localisation of the time-keepers regulating the sun and the moon compass mechanisms, 5) to assess the existence of antennal time-keepers involved in celestial orientation and 6) to confirm the capability of T. europaeus to orientate to the moon. In this work, the first evidence for the use of the celestial spectral gradient as a compass cue by T. saltator was obtained. The skylight intensity profile has also been confirmed to constitute a reliable orienting reference and it has been shown that it exists a minimum threshold of the gradient effectively recognised and used. Instead, tests carried out did not point out a clear spatial distribution of the photoreceptors within the eye of this species. However, it has been revealed that the dorsal edge of the eye plays an important role in the perception of celestial factors. These results, along with evidence of straight ommatidia occurring in this area of the eye, suggest a regionalisation of the visual capabilities in T. saltator and are in agreement with the existence of a DRA. Furthermore, it was shown that this species mainly possesses hook-shaped ommatidia (except for the dorsal region of its eye) and it was suggested that their photoreception efficiency was enhanced by reflecting pigment cells localized between them. Moreover, it was found that the oscillators underlying the sun and the moon compass mechanisms are localised in separate localities. In fact, the antennae seem to be the anatomical site of the time-keepers responsible for the lunar orientation (although our results suggest that timing inputs from these oscillators are downstream integrated), whereas those involved in solar orientation are located elsewhere (probably in the brain). Intriguingly, present work provided first molecular evidence for time-keepers in T. saltator by revealing rhythmicity in the expression of core genes in both brain and antennae (thus supporting the existence of oscillators in these appendages). Finally, it has been fully confirmed the capability of T. europaeus to orientate under the moon and provided partial evidence for discrete time-keepers underlying the functioning of the sun and the moon compass systems in this species.

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Capítulos de libros sobre el tema "Celestial orientation"

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Wiltschko, Wolfgang y Roswitha Wiltschko. "Magnetic Orientation and Celestial Cues in Migratory Orientation". En Experientia Supplementum, 16–37. Basel: Birkhäuser Basel, 1991. http://dx.doi.org/10.1007/978-3-0348-7208-9_2.

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Wehner, R. "The ant’s celestial compass system: spectral and polarization channels". En Orientation and Communication in Arthropods, 145–85. Basel: Birkhäuser Basel, 1997. http://dx.doi.org/10.1007/978-3-0348-8878-3_6.

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3

Gambis, D. "Monitoring Earth Orientation Using Various Techniques: Current Results and Future Prospects". En Dynamics and Astrometry of Natural and Artificial Celestial Bodies, 475–80. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5534-2_67.

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4

Sokolova, Yulia y Zinovy Malkin. "On the Impact of Correlation Information on the Orientation Parameters Between Celestial Reference Frame Realizations". En International Association of Geodesy Symposia, 41–44. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/1345_2015_179.

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5

Bertolucci, Cristiano, Elena Frigato y Augusto Foà. "The Reptilian Clock System: Circadian Clock, Extraretinal Photoreception, and Clock-Dependent Celestial Compass Orientation Mechanisms in Reptiles". En Biological Timekeeping: Clocks, Rhythms and Behaviour, 223–39. New Delhi: Springer India, 2017. http://dx.doi.org/10.1007/978-81-322-3688-7_10.

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6

Raposo-Pulido, V., E. Tanir Kayikci, R. Heinkelmann, T. Nilsson, M. Karbon, B. Soja, C. Lu, J. Mora-Diaz y H. Schuh. "Impact of Celestial Datum Definition on EOP Estimation and CRF Orientation in the Global VLBI Session IYA09". En International Association of Geodesy Symposia, 141–47. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/1345_2015_106.

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Heinkelmann, Robert, Santiago Belda, José M. Ferrándiz y Harald Schuh. "How Consistent are The Current Conventional Celestial and Terrestrial Reference Frames and The Conventional Earth Orientation Parameters?" En REFAG 2014, 183–89. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/1345_2015_149.

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Wu, Chunming. "A Comparative Study of the Astronomical Navigation Between Ancient China and Pacific Austronesian". En The Archaeology of Asia-Pacific Navigation, 187–206. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4079-7_8.

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AbstractAstronomical navigation was a kind of sea route orientating and steering practice the ancient seamen used to judge the direction, relative position, and track of ships in the blue water of deep sea by observing the stars, other celestial bodies, and their regular occurrence in the sky, as one of maritime piloting methods employed by ancient Chinese navigators. The comparative study of ethno-archaeology revealed that the representative astronomical navigation practices recorded in the ancient Chinese literatures are highly consistent with the “star observation method” and “star measuring method” used by both the local seamen in south China and the Austronesian navigators in Pacific, showing the close cultural connection between them.

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9

Wu, Chunming. "A Comparative Study of the Astronomical Navigation Between Ancient China and Pacific Austronesian". En The Archaeology of Asia-Pacific Navigation, 187–206. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4079-7_8.

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AbstractAstronomical navigation was a kind of sea route orientating and steering practice the ancient seamen used to judge the direction, relative position, and track of ships in the blue water of deep sea by observing the stars, other celestial bodies, and their regular occurrence in the sky, as one of maritime piloting methods employed by ancient Chinese navigators. The comparative study of ethno-archaeology revealed that the representative astronomical navigation practices recorded in the ancient Chinese literatures are highly consistent with the “star observation method” and “star measuring method” used by both the local seamen in south China and the Austronesian navigators in Pacific, showing the close cultural connection between them.

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10

Lewis, Anne-Marie. "Methods and Materials". En Celestial Inclinations, 1–18. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197599648.003.0001.

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Abstract Evidence from ancient sources indicates that Augustus was keenly aware of the celestial sphere and employed it to his advantage throughout his life. He used his astrological genitura privately for personal guidance. But, more importantly, he observed the heavens regularly to note the presence of his Julian kin in their celestial manifestations as a means of confirming for himself and conveying to friends and enemies that he was connected to the cosmos, that he was supported by these celestial kin, and that he would eventually have political success. The chapter establishes the biographical, historical, and sociocultural orientation of the book; the emphasis placed upon the interpretation of important episodes from the life of Augustus described in the ancient sources in consultation with astronomical sky maps and astrological diagrams; and the considerations that underpin the handling of time for the events discussed (calendars, dates, and hours of the day and night).

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Actas de conferencias sobre el tema "Celestial orientation"

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Jung, Sunghun, Cheng Liu y Kartik B. Ariyur. "Absolute Orientation for a UAV using Celestial Objects". En AIAA Infotech@Aerospace (I@A) Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-5145.

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Scholl, Marija S., Luisa De Antonio, Edwin W. Dennison, James W. Alexander y Randy K. Bartman. "Star-field recognition". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thc4.

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A star-field pattern recognition algorithm has been developed. It is based on matching the stars on a full celestial sphere observed in a CCD-based star tracker and the reference stars, by using the Yale bright star catalog. The correspondence between the observed and the reference star pattern is found by constructing three-star triangles in spherical geometry. Star angular coordinates and stellar magnitudes are matched to build up a celestial region of correspondence. Gaussian errors in the cataloged star coordinates and brightnesses are modeled to test the algorithm against faulty reference data. Random values are selected for the origin and the orientation of the observed star field. The possibility of hardware-introduced stars is modeled by introducing spurious data. The computer simulations and the preliminary experimental results at the Table Mountain Observatory are described.

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3

Goodell, J. B. y C. Verne Muffoletto. "Relay lens for the JHU ultraviolet telescope and spectrometer". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.fj3.

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The relay lens for the Johns Hopkins University ultraviolet telescope (HUT) will be used primarily for guidance when the HUT system flies on the Space Shuttle in 1986. It relays the focal plane image of the 1800-mm focal length, f/2 parabolic primary mirror to a vidicon at 2× magnification. The vidicon will display a star image on a TV monitor which will enable an operator to maintain Shuttle orientation. It may also be used to obtain pictures of celestial bodies including possibly, the only pictures of Halley’s Comet. The design problems associated with this six-element plus filters were very severe. For example, it relays the highly comatic, 400-μm spot in the parabola focal plane to a 25-μm spot at the vidicon. The spectral range extends from 0.4861 to 0.6500 μm. The FOV of the primary mirror is 1.5 min but the relay lens must see an input FOV equal to 30 times this quantity because of its 60-mm object distance. This presentation briefly describes the HUT system followed by a detailed exposition of the design problems and ultimate performance of the relay lens parabola combination.

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