If you don't hear from us within six hours, that means we're still at the observatory.

She worked as a "lady computer" at the Observatory from 1890 to 1895.

"I thought you had photographs to take at the Observatory."

Already in early January 1922 the association started operations at the new observatory.

His primary interest at the observatory was in solar research.

Part one could deal with our discoveries here at the Observatory.

"The work we've done at the observatory has gone for nothing," was the bitter answer.

I've been cutting a lot of classes to be out at the observatory.

I'll be at the Observatory on the evening of the nineteenth.

More than $100 million worth of research equipment is located at the observatory.