Astronomy

[rgbarnes46]

I have a need to understand how frequently parades consist of all 8 planets
with the sun either leading the parade or coming at the end of the parade.

How do I calculate the dates and frequency of these events?

I need to see 20,000 years into the past and 8,000 years into the future.

Is there a location with this data already available?

Requirements:

Must be all 8 planets
Sun must either lead or follow the parade
ie Sunset sun leads the parade of 8
or Sunrise sun follows the parade of 8

I expect the dates to be hundreds if not thousands of years apart from each
other.

I have stellarium software and can observe these dates. I have been searching
for a method to know this for several years. Ebea on your site appears to be the most
knowledgeable and helpful resource available. If you can recommend other
sources please let me know.

Sincerely,

Ronald G Barnes

 

[BSALV]

this is not an excel question, more a google-question, otherwise you need their formulas

 

[rgbarnes46]

How did you find these? Do you have a formula to calculate other such events?

 

[BSALV]

google on parade of planets

Planetary Alignment: What Is It? When Is the Next Planetary Alignment?

What is a planetary alignment, and when is the next one? Find out how to see planets line up in the sky.

starwalk.space

Astronomy conjunctions

Find out which conjunctions to look for in the night sky over the coming weeks.

www.skyatnightmagazine.com

no, i don't have any formula.