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08 Apr 2018
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TOPIC: Why are these settings different....?

Why are these settings different....? 3 months 5 days ago #25061

Hi,
I set the correct location for my backyard obsy, but I noticed each time I set up the longitude setting is different on settings screen compared to the main planetarium screes, see 1st image below

Secondly when I start my mount on home position, the DEC reading is always near to 90 degrees, 89 or so, but the RA i thought should be on zero for home...but it never is, see second image...

Any ideas of reasons for these discrepancies...??
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Why are these settings different....? 3 months 5 days ago #25064

1st) there is a difference in representation. One shows the longitude in degrees, minutes and seconds and the other in decimals. 1° 52’ 59” == 1.883056°

2nd) the Right Ascension is only exactly 0 if and when the telescope is rotated accordingly. I guess that you have your telescope pointed at the north celestial pole with the telescope directly above the mount. When it is positioned like that, it will point at the RA that currently is culminating south.
The following user(s) said Thank You: AstroNerd

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Modded Canon EOS 700D with a WO ZS 71 ED on a SW HEQ5-Pro /
QHY9 CCD and filter wheel with an 8" RC on a SW AZ-EQ6

Why are these settings different....? 3 months 5 days ago #25068

Thanks for that, but excuse my ignorance this is new to me...but was does the last sentence you wrote mean...
“It will point at the RA that currently is culminating south”....
:)

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Why are these settings different....? 3 months 4 days ago #25084

The objects that are passing through the south meridian have a certain RA. This is what the mount points at when aimed at the borth pole in rest position.

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Modded Canon EOS 700D with a WO ZS 71 ED on a SW HEQ5-Pro /
QHY9 CCD and filter wheel with an 8" RC on a SW AZ-EQ6

Why are these settings different....? 3 months 4 days ago #25085

wvreeven wrote: 1st) there is a difference in representation. One shows the longitude in degrees, minutes and seconds and the other in decimals. 1° 52’ 59” == 1.883056°

2nd) the Right Ascension is only exactly 0 if and when the telescope is rotated accordingly. I guess that you have your telescope pointed at the north celestial pole with the telescope directly above the mount. When it is positioned like that, it will point at the RA that currently is culminating south.


I actually just updated KStars to display in sexigesimal format instead of double in the location info box. Small detail, but I guess less confusing for users

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info

Why are these settings different....? 3 months 4 days ago #25088

What is a 'South Meridian'? I know a 'meridian' and an 'anti-meridian', depending on whether it passes through the zenith or the nadir, respectively. I am not aware of a distinction into north and south?

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Why are these settings different....? 3 months 4 days ago #25089

You’re right. The meridian is the line passing through the poles and the zenith and that’s what I meant. I added south in the hope to clarify things but that was wrong. Thanks for the correction!

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Modded Canon EOS 700D with a WO ZS 71 ED on a SW HEQ5-Pro /
QHY9 CCD and filter wheel with an 8" RC on a SW AZ-EQ6

Why are these settings different....? 3 months 4 days ago #25108

So is this update in the latest version of Kstars, or a seperate update...??

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Why are these settings different....? 3 months 4 days ago #25110

If you're talking about my change, it would be in the next version for Longitude/Latitude representation. For the RA/DE differences, you are comparing two different things. The EQMod screenshot for the Alignment tab, it is not the current aligned position of the mount which is found under the Main Control of the EQMod driver.
The following user(s) said Thank You: AstroNerd

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info

Why are these settings different....? 3 months 4 days ago #25113

Ok, got that, so in normal home position (scope up and weights down) what figures should I expect to see in the main control tab for RA/DEC...?

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Why are these settings different....? 3 months 3 days ago #25117

Dec should be 90°, RA whatever is passing through the meridian at that moment.
The following user(s) said Thank You: AstroNerd

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Modded Canon EOS 700D with a WO ZS 71 ED on a SW HEQ5-Pro /
QHY9 CCD and filter wheel with an 8" RC on a SW AZ-EQ6

Why are these settings different....? 3 months 3 days ago #25118

The following user(s) said Thank You: AstroNerd

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