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DARV

 
The DARV panel is accessible from Tools tab.
 
DARV stands for 'Drift Alignment by Robert Vice method'. The essential idea of the method is to make one long exposure during the mount is moved on East and then back to West (or in reverse in the southern hemisphere) if the polar alignment is perfect the result will be a flat line, in other case the track in the image will have the shape of the letter V. So you have to make corrections till the track becomes a line.
 
 
The scenario is easy to follow:     
 
1. Locate a star in the South close to Declination 0.
2. Run DARV (Align Azimuth button) and wait for routine to complete.
3. If the track is not line adjust the Azimuth (left/right).
4. If you see V shaped track, repeat the steps 2 and 3 till you get a line.
5. Locate a star in the Eastern or Western horizon and close to Declination 0.
6. Run DARV (Align Altitude button) and wait for routine to complete.
7. If the track is not line adjust the Altitude (up/down).
8. If you see V shaped track, repeat the steps 6 and 7 till you get line.     
 
This tool is made to take care for exposure and telescope move, so it requires Camera and Telescope connection.
 
 
The duration of the drift depends on the focal length of your telescope or lens. Longer it is shorter drift time has to be used.
 
More information about Robert Vice method can be found here: