Enter the right ascension, declination, and the Epoch of the coordinates for the center of the area of sky you want to view. Hours and degrees can be entered as decimal values and when you click in another entry box the decimal entries are automatically converted to minutes and seconds. If you enter a negative value, the South radio button is automatically selected when you click in another entry box. Enter the dimensions of the area, in arcminutes. The Width and Height do not have to be the same.
Fractional values are okay.
The size of a decompressed image is limited to 120x120 arcminutes. An image this size requires about 28 MB of free memory. The default Epoch is 2000.0. To enter Epoch 1950.0 coordinates, click on the arrow in the Epoch box and select 1950.0. Click View to open the appropriate DSS image.