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A modest-sized telescope under dark skies shows that it extends for at least half a degree (the angular diameter of the Moon).
5 arc minutes, or one-twentieth of the angular diameter of the full moon.
The feature is approximately 25,000km across which equates to an angular diameter of just under 4 arcseconds when the planet was at opposition on April 28.
40 kiloparsecs  and has an angular diameter of 16 arc-seconds .
From Hubble data, they determined that the ring has an angular diameter of 1.
It is also rather faint, with a visual magnitude of around +16, and has a small angular diameter with the ring being about 17".
Tango of the University of Sydney, report that they have determined the angular diameter of the star Sirius by a new interferometry, that has not previously been used for stars of ordinary size.
100-170 AD) determined the apparent angular diameter of the Moon to be equal to or larger than that of the Sun, which he considered to be constant.