USNO astronomical twilight times
for
Champaign/Urbana Astronomical Society Observatory Clear Sky Chart


from: http://www.usno.navy.mil/USNO/astronomical-applications/data-services/rs-one-year-world
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Location: Champaign/Urbana Astronomical Society Observatory


Other UNSO yearly tables:

Champaign/Urbana Astronomical Society Observatory Clear Sky Chart | Charts Home