An 'order of magnitude estimate' of a variable whose precise value is unknown is an estimate Rounding to the nearest power of ten.

An order of magnitude estimate is sometimes also called a zeroth order approximation.

Using Morris' algorithm, the counter represents an "order of magnitude estimate" of the actual count.

Also, records that were detailed enough to make magnitude estimates (est.) were not generally available before 1900.

He made several corrections to Ptolemy's star-list and did his own brightness and magnitude estimates which often differed from those in Ptolemy's work.

The largest earthquakes to have occurred since then were on January 4, 1843, and October 31, 1895, with magnitude estimates of 6.0 and 6.6 respectively.

This value is taken as the uncertainty of the magnitude estimate in real time.

A later study confirms this order of magnitude estimate.

Describing more visual magnitude estimates and orbital parameters from 1984.

Describing visual magnitude estimates of comet from 1984.