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By "precession circle" do you mean the trajectory of the pole within the stars? This need a specific function to input the time range for the display and drawing the line at both pole. Please confirm this is what you need so I can implement it. |
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Yes, that is what I mean. I imagine something like this (the orange line): https://upload.wikimedia.org/wikipedia/commons/1/16/Precession_N.gif |
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The function is implemented by : https://github.com/pchev/skychart/commit/9437842efa06eb86e2dc03dc9a226b87a91e928f You can test by installing a temporary version from https://vega.ap-i.net/tmp/skychart/ Will be in standard beta version next Monday. Open the menu View / Pole precession. Enter the date range and if you want mark or labels, click Apply. The circles are removed when this form is closed. The pole path is show for both North and South pole. Attached two example: prec-2023.png : the detail for the currents years. prec-all.png: the precession for the full range of validity of Vondrak 2011 theory, -200k to +200k. Tell me if OK for you. prec-2023.png (35,135 bytes) prec-all.png (390,425 bytes) |
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Works great, thanks for a fast solution to this! |
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Thank you to suggest this feature, it is more interesting than what I thought first! |
- Anonymous
