Vertex - mundane calculations

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Jim Eshelman
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Vertex - mundane calculations

Post by Jim Eshelman » Mon May 08, 2017 11:46 pm

(Originally posted 9/28/2012, 4:06 AM, years before I came back to work this out ore thoroughly.)

A few weeks ago, somebody asked me (in some thread or another) how to calculate when a planet crosses the Vertex-Antivertex mundanely, rather than simply measured in ecliptical longitude. I said I didn't know.

Tonight I realized how to do this in a forehead-slapping Doh! moment. It's super-easy with a chart calculation tool such as Solar Fire.

"Mundane crossing" of the Vertex axis means that the planet is on the great circle called the Prime Vertical. This happens when the planet's azimuth is 90° (east) or 270° (west).

Doh!

Now, I don't at all know that we should be calculating this mundanely. (None of us knows that since, until now, nobody had said how to do it.) But now we can start watching.
Jim Eshelman
www.jeshelman.com

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Jim Eshelman
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Posts: 5565
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Re: Vertex - mundane calculations

Post by Jim Eshelman » Mon May 08, 2017 11:47 pm

Freya wrote:Thank you Jim :)

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