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Magic
Suppose you have taken a photo with some stars in it, and you can't remember exactly what you were trying to point at at the time. For example, this one
I've had to mangle it a bit in Photoshop to make it more obvious that it's a field full of stars.
If you go to http://nova.astrometry.net and click 'upload' and send them the full-size, unmangled-in-Photoshop version of the picture (available here) then after forty seconds of processing in the cloud you get back
and a version of the image with the stars and constellations marked on it:
I've had to mangle it a bit in Photoshop to make it more obvious that it's a field full of stars.
If you go to http://nova.astrometry.net and click 'upload' and send them the full-size, unmangled-in-Photoshop version of the picture (available here) then after forty seconds of processing in the cloud you get back
| Center (RA, Dec): | (96.103, 34.407) |
| Center (RA, hms): | 06h 24m 24.652s |
| Center (Dec, dms): | +34° 24' 25.689" |
| Size: | 43.5 x 28.9 deg |
| Radius: | 26.107 deg |
| Pixel scale: | 36.5 arcsec/pixel |
| Orientation: | Up is 129 degrees E of N |
and a version of the image with the stars and constellations marked on it:
no subject
I saw something about astrophotography just the other day... ah yes, Scott Manley has a video (https://www.youtube.com/watch?v=Twti9xuhNsk) on something called Registax that lets you take a series of photos and combine to get a good composite.