Joyce called out his figures, in seconds of arc to three places.

This system has a relatively high proper motion, moving over a second of arc across the sky each year.

You had to fine-tune in from only twelve seconds of arc.

I will show you such a double star in Andromeda, less than a second of arc apart.

Whatever the actual reason, they have trouble aiming more accurately than three seconds of arc.

In that brief second of arc he filled his lungs then submerged.

If salvage does come, they'll need contact-a second of arc is a big distance out here.

Thus the instrument could have readings interpolated to 5 seconds of arc.

Note that these are distinct from, and 15 times larger than, minutes and seconds of arc.

Errors during tracking and scanning are typically less than ten seconds of arc.

But at last the angle was correct, to a fraction of a second of arc.

The Randot test can measure stereoacuity to 20 seconds of arc.

DEC may be entered to the nearest second of arc.

Nevertheless, his tabulated values remain accurate to within a few seconds of arc to this day.

Beta has a sixth magnitude optical companion at 205 seconds of arc.

Then the changes of angle in seconds of arc per year are:

Observations taken down to a second of arc are simply not precise enough to bring them within detection range of one another.

In general the instrument measures angles in degrees, minutes, and seconds of arc.

This margin of error is usually listed in minutes or seconds of arc.

The apparent size of an object, usually expressed in degrees, minutes, or seconds of arc.

The star was a certain number of seconds of arc from the planet's sunlit edge.

Published value of proper motion in seconds of arc per annum.

It is the 36th closest known star system to the Sun and has a relatively high proper motion of 1.2 seconds of arc per year.

It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 seconds of arc.

The screen shows her subtending over six seconds of arc at the station, and she's still more than sixty thousand kilometers out.

In comparison, most major astronomical sites average seeing under one arcsecond.

But these are small angles, typically just fractions of an arcsecond.

This unique pointing instrument was designed with an accuracy of one arcsecond.

The telescope has a resolving power of 0.05 arcsecond.

The arcminute and arcsecond are also used in astronomy.

Adaptive optics, for example, can produce images around 0.05 arcsecond on a 10 m class telescope.

Surface brightnesses are usually quoted in magnitudes per square arcsecond.

An arcsecond (second of arc) is a unit of angle used in astronomy.

This is the distance at which a star would show a parallax shift of exactly one arcsecond as observed from Earth's orbit.

However, atmospheric effects (astronomical seeing) typically limit accuracy to one arcsecond in most situations.

It is a suspected occultation double, with both stars having the same magnitude, separated by 0.25 arcsecond.

The distance at which one astronomical unit subtends an angle of one arcsecond.

The resolution of the raw data is one arcsecond (30 m), but this has only been released over United States territory.

The smallest details in these pictures are one arcsecond in size, that is, about the apparent diameter of the Moon.

Its companion, 12 Boötis B, is separated from the primary by approximately one arcsecond.

The dwarf planet Pluto has proven difficult to resolve because its angular diameter is about 0.1 arcsecond.

Jean is analysing the data from his first two balloon launches, and is getting ``seeing'' figures of around 1 arcsecond.

During their closest approach, they were separated by less than 0.1 arcsecond, compared to their current separation of 2 arcseconds.

However, the images are much more sophisticated, allowing, for example, velocity and spectral continuum measurements at 4 arcsecond resolution.

The positions of most are known to 0.001 arcsecond or better, which is orders of magnitude more precise than the best optical measurements.

Observation with the Hubble Space Telescope has detected no companion beyond 0.15 arcsecond.

The spatial sampling scale at the detector is 44μm per arcsecond giving a field of view of about 10.5 arcminutes on the side.

The sky needs to be darker than about 20.2 magnitude per square arcsecond in order for the Milky Way to be seen.

These subdivisions, also called the arcminute and arcsecond, are respectively represented as a single and double prime.

A single optical telescope may have an angular resolution less than one arcsecond, but astronomical seeing and other atmospheric effects make attaining this very hard.