arcsecond

Each 1-arcsecond resolution product was converted to 3 arcseconds using a method appropriate to the type of data.

* I verified that the two methods give the same results within the precision required (one arcsecond) and then used the faster and easier 'tracking' method to measure angular separations.

I ended up recording a new correction curve with PEMPro (which is included with the mount), and the periodic error dropped to 1.8 arcseconds. In actual use with autoguiding during long-exposure imaging, I found the guiding accuracy to be better than 0.5 arcseconds in poor seeing.

A degree is made up of 60 arcminutes (60'), and each arcminute is made up of 60 arcseconds (60").

A degree is made up of 60 arcminutes, and each arcminute is divided into 60 arcseconds.

In order to measure a tiny deflection of as little as 0.02 arcsecond, excellent stellar images are needed--and that's entirely possible today.

The Hubble's 2.4-meter mirror can resolve objects 0.1 arcsecond apart at 1 micron, but only because it flies about 350 miles above Earth's surface.

"We can, for the first time, make long-exposure images that resolve objects just 0.02 arcseconds across--the equivalent of a dime viewed from more than 100 miles away.

In the middle two weeks of April, Mars will shine with a brightness of magnitude -1.5, matching the luster of Sirius, and in a telescope it will appear 15.1 arcseconds across.

The cluster is 95 arcseconds across, meaning it is three times the size of the full Moon, although it is quite diffuse.

The second-brightest star in the Sickle is Gamma ([gamma]) Leonis or Algieba, which a telescope reveals to be a fine double star (separation 4.5 arcseconds) with both components pale yellow-orange.

Its apparent size will be 25.1 arcseconds, enough to make it the biggest object in the night sky besides the moon.

With this information, scientists can estimate the number of people located in rectangles measuring 30 arcseconds of the Earth's circumference on a side.

Adjusting the position of a computerized mount and having software report that your alignment is within a few arcseconds of the celestial pole may be very satisfying, but it's likely true only for the current conditions.

The dispersed planetary image at the focus of a telescope objective has its various wavelengths spread vertically over a small angular range, typically a few arcseconds at most, forming a short spectrum.