# What is Earth's current true anomaly from j2000?

I enjoy amateur astronomical calculations. I calculate earth true anomaly and noticed a bug in my software just as earth passing through j2000 point and instead of going to 0 degrees it subtracting from 360.

But I checked wolfram alpha and with in a few days went from like 359 degrees now reports 179 degrees. If J2000 was 358 degrees or so, it should be very close to that or 0 degrees approx today, January 3, 2019?

• Would Astronomy be a better home for this question? – Qmechanic Jan 3 at 10:06
• I'm not sure, it's really a question of precise mathematical notation for elliptical orbit. – marshal craft Jan 3 at 10:11
• It probably may be a good or better place, they probably use it to determine exact position of stars for viewing. – marshal craft Jan 3 at 10:16
• I dont know how to easily move question? – marshal craft Jan 3 at 10:16
• Do you mean that PlanetData["Earth", "TrueAnomaly"] is calculating the wrong angle? Then this question should be raised on mathematica.stackexchange.com/questions – Alex Trounev Jan 3 at 13:14