But the disadvantage is that even tiny errors can spoil observations using optical interferometry.

The first observations using the system - measurements of 30 distant radio sources - were taken in January and February 1980.

This is because astronomical observations using the hardware can take place only at certain times of the year.

The principal measure was non-participant observation using a 20second momentary time-sample.

Henry Norris Russell developed his star classification system based on observations using the Hooker.

To identify and understand the biases it is useful to compare observations using probability distribution functions.

When observations are made, students may frame the observations using the concept of "the centers."

The first astronometrical observation using all ten antennas was carried out on May 29, 1993.

He also illustrated a large workshop camera obscura for solar observations using the telescope and scioptric ball.

This process can be carried forward with additional observations using: