Astronomer's Tools
Computing Exposure Times with the IRAF Task CCDTIME
ISPI Exposure Time Calculator: for ISPI infrared imager on Blanco 4-m telescope.
SMARTS Imager Exposure Calculator: for 0.9-m CCD and 1.0-m Y4KCam
Object Visibility: ING utility which plots altitude against time for a particular night (Staralt), plots the path of your objects across the sky for a particular night (Startrack), plots how altitude changes over a year (Starobs), or gets a table with the best observing date for each object (Starmult).
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