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Stellarium / stellarium

Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows and macOS. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.
https://stellarium.org
GNU General Public License v2.0
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advance selected object to next az/alt crossing #3737

Open axd1967 opened 6 months ago

axd1967 commented 6 months ago

Is your feature request related to a problem? Please describe. I'd like to know when a selected object crosses a meridian/azimuth OR altitude so that I can plan a photo session on that direction or altitude.

Describe the solution you'd like Similar to the Solar altitude for twilight finder, provide a feature that allows me to jump to a preset az OR alt

Describe alternatives you've considered Manually advance time via the Archaeolines plugin (which provides me a first idea of where an object will cross an az/alt).

Additional context

image

github-actions[bot] commented 6 months ago

This is a good task for the community to participate in the contribution into Stellarium. Who wants to help us?

github-actions[bot] commented 6 months ago

Hello @axd1967!

Thank you for suggesting this feature.

alex-w commented 6 months ago

Why don't use shortcuts for Specific Time section?

stellarium-004

axd1967 commented 5 months ago

because

  1. there is no option "selected object at current azimuth at (next/previous) time". (not: at next/previous twilight/evening/morning) ; better is an option to advance time to object's next crossing of display's centerline (which is visualised by the altitude line)
  2. there is no option to advance time to "selected object at current altitude at (next/previous) time"
alex-w commented 5 months ago

So, you didn't check the feature...

gzotti commented 5 months ago

(1) is related to the qibla problem ("When does the sun point towards Mecca"). I have solved it on some other tools, but so far I don't know any other use to justify its implementation in Stellarium. It may go into ArchaeoLines, though. (2) waits for you to set your favourite hotkey. We don't want to preconfigure 30 buttons or hotkeys for most users who never would press them.

axd1967 commented 5 months ago

I need it to know when sun, moon, planet,or star is at a specific altitude above some other feature, such as a tower.

can we please stop the bickering? several of the issues that have been rejected initially, finally ended up being implemented.

I cannot put developer effort in a team that is constantly attacking me and constantly closing valuable inputs, sorry.

axd1967 commented 5 months ago

Note also that the twilight finder does not allow positive altitudes, which is questionable. please don't explain to me that there is no twilight when the Sun is above the horizon.

again, there is NO REASON (especially no mathematical one) to limit this value to negative values. it is up to the user to decide if a positive twilight finder makes sense.

this has been discussed several times for other features: think twice before imposing useless limits; don't restrict users that want to explore unusual values, as long as there is no mathematical limit.

axd1967 commented 5 months ago

So, you didn't check the feature...

@alex-w I can use "at altitude" but I want "at azimuth" instead (which is not "at transit")

in other words: what is the time when a given object crosses a given azimuth?

10110111 commented 5 months ago

twice before imposing useless limits; don't restrict users that want to explore unusual values, as long as there is no mathematical limit

There is a semantic limit. And I expect that if we let this control attain positive values, at some point we'll get an issue that "next twilight goes to a day time" due to the the user having made a mistake in sign long ago and now wondering what's going on.

gzotti commented 5 months ago

I cannot put developer effort in a team that is constantly attacking me and constantly closing valuable inputs, sorry.

Sorry for bickering from my side now. We almost never see developer effort from your side. You issue your wishes, and we like them or, unfortunately more often, we don't. I said I might implement (1) into ArchaeoLines, so I did not close this issue. And no, it never occurred to any developer that twilight is when the sun is above the horizon, which is why there are limits governed by astronomical definitions. The usual application for this function is nightfall (or daybreak), but users may have preferences on what they want to see -- Mercury or some comet.

And as mentioned before, there is a profuse collection of tools available, waiting for you to set your hotkeys. stellarium-106

Yes, I am also just seeing something does not fully work as intended. Let's put our precious time into such issues.