"April 2019."
Astronomy 2019. , 2019. Web. 23 Feb. 2019.
<http://www.whitakersalmanack.com?id=-119768CITANCHOR>.
"April 2019."
Astronomy 2019. , 2019.
http://www.whitakersalmanack.com/?id=-119768CITANCHOR.
Astronomy 2019
Whitaker's Almanack
January 23, 2019
February 23, 2019
http://www.whitakersalmanack.com/?id=-119768CITANCHOR