Orbital period (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Orbital period" in English language version.

refsWebsite

Global rank English rank

2wolframalpha.com

4,660^th place

5,295^th place

2books.google.com

3^rd place

3^rd place

513^th place

537^th place

1astronomycafe.net

low place

low place

75^th place

83^rd place

astronomycafe.net

"Questions and Answers - Sten's Space Blog". www.astronomycafe.net.

books.google.com

Oliver Montenbruck, Eberhard Gill (2000). Satellite Orbits: Models, Methods, and Applications. Springer Science & Business Media. p. 50. ISBN 978-3-540-67280-7.
Hannu Karttunen; et al. (2016). Fundamental Astronomy (6th ed.). Springer. p. 145. ISBN 9783662530450. Retrieved December 7, 2018.

nasa.gov

nssdc.gsfc.nasa.gov

"Planetary Fact Sheet". nssdc.gsfc.nasa.gov.

wolfram.com

demonstrations.wolfram.com

"Precession of the Earth's Axis - Wolfram Demonstrations Project". demonstrations.wolfram.com. Retrieved 2019-02-10.

wolframalpha.com

Density of the Earth, wolframalpha.com
Density of water, wolframalpha.com