Results 41 to 50 of about 34,671 (262)

Broadcast Ephemeris with Centimetric Accuracy: Test Results for GPS, Galileo, Beidou and Glonass

open access: yesRemote Sensing, 2021
Here we test the capability of the Broadcast Ephemeris Message, in both its GPS-like (Keplerian ellipse with secular and periodic perturbations) and Glonass-like (numerical integration of a 9D state vector) formats, to reproduce a corresponding precise ...
Alessandro Caporali, Joaquin Zurutuza
doaj   +1 more source

Analysis of Solar and Lunar Motions in the Seonmyeong Calendar

open access: yesJournal of Astronomy and Space Sciences, 2019
We investigate solar and lunar motions in the Seonmyeong (SM) calendar that was compiled by Xu, Ang of the Tang dynasty (A.D. 618-907) in China and used for 71 years from 822 to 892.
Ki-Won Lee
doaj   +1 more source

PERHITUNGAN DATA EPHEMERIS KOORDINAT MATAHARI MENGGUNAKAN ALGORITMA JEAN MEEUS HIGHER ACCURACY DAN KETERKAITANNYA DENGAN PENGEMBANGAN ILMU FALAK

open access: yesJurnal Ilmiah Islam Futura, 2017
Data of solar coordinate such as longitude and latitude of the ecliptic, declination, and right ascension are the data that are often involved in astronomical reckoning and practical islamic astronomy.
reza akbar
doaj   +1 more source

Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b [PDF]

open access: yes, 2016
Most hot Jupiters are expected to spiral in towards their host stars due to transfering of the angular momentum of the orbital motion to the stellar spin. Their orbits can also precess due to planet-star interactions.
Bukowiecki, Ł.   +13 more
core   +2 more sources

Performance of Multi-GNSS in the Asia-Pacific Region: Signal Quality, Broadcast Ephemeris and Precise Point Positioning (PPP)

open access: yesRemote Sensing, 2022
Since BeiDou Navigation Satellite System (BDS) and Japan’s Quasi-Zenith Satellite System (QZSS) have more visible satellites in the Asia-Pacific region, and navigation satellites of Global Positioning System (GPS), Galileo satellite navigation system ...
Mengyuan Li   +4 more
doaj   +1 more source

At the far end of everything: A likely Ahrensburgian presence in the far north of the Isle of Skye, Scotland

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT A Late Upper Paleolithic (LUP) site containing Ahrensburgian‐type stone tools has been discovered at South Cuidrach, Isle of Skye, Scotland. Together with a group of intertidal stone circular alignments also recently discovered on the island, this new evidence for the occupation of northern Scotland also represents the most northerly LUP site ...
Karen Hardy   +5 more
wiley   +1 more source

Performance Assessment of Non-Integer-Hour Data Blocks in BDS Broadcast Ephemeris

open access: yesIEEE Access
Due to system anomalies, BeiDou navigation satellite system (BDS) sometimes updates the broadcast ephemeris at non-integral hours. The gross errors contained in the non-integer-hour data blocks of broadcast ephemeris will lead to the signal-in-space (SIS)
Jingjing Wang, Chao Zhou
doaj   +1 more source

An exploration of market mechanisms to the wicked problem of space debris 太空垃圾棘手问题的市场机制探究 Una exploración de los mecanismos del mercado para resolver el complejo problema de los desechos espaciales

open access: yesRisk, Hazards &Crisis in Public Policy, EarlyView.
Abstract Near‐earth orbits are becoming congested because of a rapid growth in the number of satellites and space debris, which presents a real threat to the sustainable use of space and the safety of the Earth. Despite space scientists and public policymakers having been actively seeking solutions for decades, solving the problem has been put off ...
Anna Ya Ni   +2 more
wiley   +1 more source

The fettered and the flea: a new poem by Edmund Waller☆

open access: yesRenaissance Studies, EarlyView.
Abstract This contribution explores for the first time a 22‐line poem in a British Library manuscript, ‘To a young lady that kept a flea chay'nd in a box’, which can be convincingly ascribed to Edmund Waller. Its most famous relative is Donne's ‘The Flea’, but its ancestry differs.
Stuart Gillespie
wiley   +1 more source

Study on systematic errors of BDS-3 broadcast ephemeris and their effects with Helmert transformation

open access: yesSatellite Navigation, 2023
Previous studies have not evaluated the systematic errors implied in the third generation of BeiDou-3 Navigation Satellite System (BDS-3) broadcast ephemeris.
Min Li   +4 more
doaj   +1 more source

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