How can I determine or estimate when Aspect starts and ends

astrorigin / pyswisseph

Python extension to the Swiss Ephemeris

https://astrorigin.com/pyswisseph

GNU Affero General Public License v3.0

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How can I determine or estimate when Aspect starts and ends #60

Open jeferson-sb opened 2 years ago

jeferson-sb commented 2 years ago

Hi folks,

I'm working on implementing a Transits chart and I need to list aspects for planets in a particular day. I'm able to determine the aspect between two bodies with swe_calc_ut successfully but I cannot estimate how long that aspect will occur. So I need to represent the two dates where that aspect will stay, for example

Sun opposition Mars  ✔️
20 Oct - 01 Nov

I know there is the next_aspect_with method under the contrib module but it can only display the future dates of that same aspect.

@astrorigin

jeferson-sb commented 1 year ago

bump

NodBr commented 6 months ago

I may have an idea using to loops. For sake of simplicity, I will call:

D+0 is the day you're interested in
D+1, D+2, etc are the following days
D-1, D-2, etc are the previous days.

Start date:

Create a new chart with the date D-1;
Check If the aspect is still there;
If it's not, you know it started today;
If it's there, check D-2, D-3, etc

End date:

Do the same but going forward;
D+1, D+2, D+3, etc.
When it's not there anymore, you know it ended

Depending on your project, after knowing the date, you may go deeper to find the hour using the same idea

jeferson-sb commented 6 months ago

@NodBr Yeah, I did something similar to this in our project, thanks for the response anyways.