Hourly Airmass

See also: Object Observability - Airmasses - Daily Almanac - Sky Calendar

This tool provides hourly airmasses, parallactic angle and heliocentric-barycentric corrections based onsite, date, and object coordinates information. Times are given forthe 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.


Date (yyyy mm dd):

Object Coordinates (J2000)
  RA:   Dec:

Time step:

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