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American Journal of Astronomy and Astrophysics

Archive

2024, Volume 11
2023, Volume 10
1. Issue 2, Jun.
2. Issue 1, Mar.
2021, Volume 9
2020, Volume 8
2019, Volume 7
2018, Volume 6
2017, Volume 5
2016, Volume 4
2015, Volume 3
2014, Volume 2
2013, Volume 1

Volume 9, Issue 1, March 2021

Calculation of Solar Motion for Localities in the USA

Keith John Treschman

Issue: Volume 9, Issue 1, March 2021

Pages: 1-7

Received: 17 December 2020

Accepted: 31 December 2020

Published: 12 January 2021

DOI: 10.11648/j.ajaa.20210901.11

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Abstract: Even though the longest day occurs on the June solstice everywhere in the Northern Hemisphere, this is NOT the day of earliest sunrise and latest sunset. Similarly, the shortest day at the December solstice in not the day of latest sunrise and earliest sunset. An analysis combines the vertical change of the position of the Sun due to the tilt of Ea... Show More

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On Cosmic Epochand Linear Size/Luminosity Evolution of Compact Steep Spectrum Sources

Ezeugo Jeremiah Chukwuemerie

Issue: Volume 9, Issue 1, March 2021

Pages: 8-12

Received: 4 March 2021

Accepted: 16 March 2021

Published: 7 April 2021

DOI: 10.11648/j.ajaa.20210901.12

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Abstract: We have used analytical methods in this paper to obtain a mathematical relation that describes relationship between the linear size of compact steep spectrum (CSS) sources and their redshift. Result shows that the source linear size has an inverse power-law dependence on the redshift. Moreover, for the purpose of obtaining an empirical relation tha... Show More

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