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An Orientation to Stardial's Data |
An Orientation to Stardial's Data
The charts that accompany Stardial images have North up and East to the left; the
Stardial images have North to the right and East up, so you'll have to
rotate the charts clockwise 90 degrees to make them correspond
to the Stardial images. Each Stardial image covers 8 degrees of declination
and 20 minutes of right ascension. The limiting magnitude of the Stardial
images is 12.5, and for the charts it is 11.0. The images are made with a
red filter, and the charts are made from green-yellow light images, so
a very red star will appear brighter on the images than it is represented on
the charts.
An example image, with labels superimposed upon it, is attached below.
Click here if your
browser didn't load the JPEG Stardial image; here it is in GIF format.
The chart below has been rotated clockwise 90 degrees to facilitate
comparison with the image.
