Observability plugin: altitude, rise, set incorrect

[misibacsi]

In Observability plugin the altitude data probably is incorrect.

I selected the Sun, and set the date 21st June. I was interested in the altitude of the culmination point.

For example, at the "Tropic of Cancer" (23 deg. 26 min) it gives: 80 deg. but the correct value is 90 deg.

At the Equator (0 deg.) it gives: 56 deg., but the correct value is 66,5 deg.

All the other places give incorrect values - or I misunderstood something.

Probably the rise and set times are also incorrect.

I checked the data with the SOLEX v110 astronomical program.

[Ivan Marti-Vidal (i-martividal)]

Hi,

Thank you for your feedback!

I just downloaded the latest trunk version and compiled it. The Observability plugin is not showing the behaviour described in the bug. It's working well in my case!

I turned Observability on and selected the Sun. Then, I set the date to 21 June and set the latitude to 23deg 26min. The culmination estimate by Observability is then 90 deg., as expected.

When I set latitude to 0 deg. the culmination is estimated as 67 deg., also as expected. The raise and set times are also OK.

What is the version of Stellarium that shows this bug?

    Best Wishes,

        Ivan

[Ivan Marti-Vidal (i-martividal)]

Hi!

I think I figured out what's happening in your case. You may have the horizon altitude set to 10 degrees (see the "Horizon altitude" in the plugin configuration window). If that is correct, the rise and set times are then computed for that particular altitude (i.e., 10 deg above real horizon) as well as the culmination altitude is also computed with respect to these 10 deg. Hence the difference.

I don't know if it's better to add the string "above horizon" at the end of the culmination info, or compute the culmination altitude always with respect to the real horizon. The later could be confusing, imho. What do you think is the best option?

    Best Wishes,

         Ivan

[misibacsi (listas123)]

Hello,

The bug is gone with installing Stellarium 0.13 alpha3 version. So, the data seem to be correct now.

What you asked: I think "it's better to add the string "above horizon: x deg." at the end of the culmination info". Maybe you can add this to rising and setting time also. (if someone changes it from the default zero value)

Anyway I did not change the "above horizon" value, it was set at the default zero deg.

Maybe this bug report can be closed.