During the design, I observed the sun at different times of year.

But never before had he been observed in two places at the same time.

It has been observed at the federal level only since 1986.

Observe these two, even at the risk of your life.

"I should like to observe the process at some future time."

In his days as a political reporter he had observed many of them at close range.

He also interviewed 80 people who observed the group at work.

All science can do is observe and look at the facts.

One of their colleagues was observing the science building at the university.

All three results are often observed, at different locations, within the same individual.