angular diameter

To put these figures in perspective, the Sun's angular diameter is 32 minutes of arc, a little over half a degree.

Astronomers also measure the apparent size of objects as an angular diameter.

The ring was almost 30 arcminutes across, the same angular diameter as the full moon.

Using this instrument he became the first person to measure the angular diameter of the star Sirius.

In 1941 he measured angular diameter of Mars using photographic plates.

The sun follows only 0 30' angular diameters after Nequam.

For bodies which appear smaller in angular diameter than the Sun, the proper term would be a transit.

Since these angular diameters are typically small, it is common to present them in arcseconds.

The angular diameter distance is a distance measure used in astronomy.

They are about 6 degrees in angular diameter.

In astronomy the term apparent size refers to the physical angle or angular diameter.

Perhaps contrary to readers' expectations, the sun and the moon have the same angular diameter!"

For example, the full moon has an angular diameter of approximately 0.5 , when viewed from Earth.

The angular diameter distance depends on the assumed cosmology of the universe.

From this distance, the sun's angular diameter is reduced to one and a quarter arcminutes across.

The angular diameter of a spiral galaxy, for instance can be easily measured by observation.

The size of Antares may be calculated using its parallax and angular diameter.

The calculations begin with the formula for a star's angular diameter, as follows:

Point-five degrees is the angular diameter of both the sun and the Moon as seen from Earth.

Then the Sun's angular diameter was about two thirds of a second of arc greater than it is today.

Estimating the angular diameter may not be very easy and can be prone to error.

Infrared interferometry was used to calculate its angular diameter at 6.93 0.15 mas.

By measuring its apparent angular diameter in the sky, one can determine its distance from Earth.

Janus, a very close moon to Saturn, has an angular diameter of about 7', meaning that it can fully cover the sun.

A sickle moon trailed, a fourth again the angular diameter of Luna seen from the ground.