The ESO Sky Calendar Tool

The Sky Calendar Tool: Hourly Airmasses

This tool provides hourly airmasses, parallactic angle and heliocentric-barycentric corrections based on site, date, and object coordinates information. Times are given for the local time, including daylight saving times when applicable.

Select site, object coordinates and date; then press Compute. The time step can also be chosen (defaults to 1 hour).

More detailed information is provided is a separate document Notes for Skycalc by John Thorstensen.

SkyCalc provided by courtesy of John Thorstensen, Dartmouth College. John.Thorstensen@dartmouth.edu