User talk:82.65.5.87

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February 2014[edit]

Hello, I'm Velella. Your recent edit to the page Tropical year appears to have added incorrect information, so I removed it for now. If you believe the information was correct, please cite a reliable source or discuss your change on the article's talk page. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks.  Velella  Velella Talk   20:14, 18 February 2014 (UTC)

Information icon Please refrain from making nonconstructive edits to Wikipedia, as you did at Tropical year with this edit. Your edits appear to constitute vandalism and have been reverted or removed. If you would like to experiment, please use the sandbox. Administrators have the ability to block users from editing if they repeatedly engage in vandalism. Thank you. --Slazenger (Contact Me) 20:21, 18 February 2014 (UTC)

Year length[edit]

The year length of 365.25 days is not imprecise. It is the Julian year, and formulas in astronomy such as calculating the length of the tropical year assume Julian years and centuries. Saros136 (talk) 07:40, 20 May 2014 (UTC)

More than 360 degrees.[edit]

There is such a thing as changing 360 degrees, and even more. Rotating 360° is different than rotating 720° or 0°. And some of the formulas in, say, Astronomical Algorithms , by Jean Meeus. So it makes sense to speak of a longitude increasing 360°

More important is the concept of a rate of change. You calculate the rate of change at one instant, and calculate the length of time required for the longitude to change 360° at that given instantaneous rate. The actual rate will have changed during that time.

Saros136 (talk) 07:50, 20 May 2014 (UTC)