pyephem sun apparent-diameter

Question

I am using PyEphem to compute Right ascension and declinaison of the sun in order to determine the astronomic azomut of a target with a theodolite.

As I cannot aim at the center aof the sun with my theodolite, I need to correct the azimut of the sun from the apparent diameter of the sun. Is there a way to get it from PyEphem ?

best regards, JB

I'm voting to close this question as off-topic because it does not appear to be about programming. Perhaps https://astronomy.stackexchange.com/ would be a better fit? — Brian Tompsett - 汤莱恩, Jun 29 '18 at 09:13
I is a question about pyephem toolbox use, not really astronomy. — Jacques Beilin, Jun 29 '18 at 09:59

score 0 · Answer 1 · answered Jul 03 '18 at 02:16

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The PyEphem documentation mentions the word "diameter" in its definition of the .radius of a body — search this page for the phrase "diameter":

http://rhodesmill.org/pyephem/quick.html

Can you use half of that angle to correct the azimuth?

answered Jul 03 '18 at 02:16

Brandon Rhodes

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score 0 · Answer 2 · answered Jul 04 '18 at 07:23

Thank you for the answer.

It seems to give a correct value.

Yesterday I found another way to do it. The body has also a earth-distance attribute. As the diameter of the sun is known, it is easy to calculate the apparent diameter

see https://fr.wikipedia.org/wiki/Taille_apparente for the formula.

pyephem sun apparent-diameter

2 Answers2