The Gilbert Rotary Centennial Observatory is operated by the East Valley Astronomy Club, through agreement with the Town of Gilbert, for the benefit of the community.  Donations to the observatory enable the East Valley Astronomy club, a registered 501 c3 non-profit organization, to maintain the GRCO facility and support EVAC educational outreach.

Donations by check to the Gilbert Rotary Centennial Observatory should be made out to the East Valley Astronomy Club with a notation for GRCO. 

Mailing Address:

EAST VALLEY ASTRONOMY CLUB, INC. PO BOX 2202 MESA AZ 85214-2202