| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Expression | 1. (Astron.), the arc which measures the least distance from the sun at which, when the sun is below the horizon, a star or planet emerging from his rays becomes visible.[Websters]. | |
| Top | ||
| Expressions | Definition | ||
| Arc of vision | (Astron.), the arc which measures the least distance from the sun at which, when the sun is below the horizon, a star or planet emerging from his rays becomes visible. Source: Webster's Revised Unabridged Dictionary. | ||
Source: compiled by the editor from various references; see credits. | Top | ||