American Journal of Astronomy and Astrophysics

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: Dec. 17, 2020
    Accepted: Dec. 31, 2020
    Published: Jan. 12, 2021
    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
  • 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: Mar. 04, 2021
    Accepted: Mar. 16, 2021
    Published: Apr. 07, 2021
    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