In-Depth: The Eerie Magnificence Of The Apple Watch Photo voltaic Face, And The Anatomy Of Dusk

Nevertheless, the disappearance of the Solar’s higher limb beneath the horizon doesn’t imply evening falls immediately, like somebody shutting off a light-weight swap. As a substitute, it’s the starting of a interval known as twilight. Twilight is the interval between sundown and true dusk, when the final little bit of daylight lastly vanishes, and the sky turns into utterly darkish. Twilight, because it seems, is additional divided into three phases: Civil Twilight, Nautical Twilight, and Astronomical Twilight, and it’s the phases of twilight, plus sundown, that are indicated by the 4 dots clustered at sunset. As every sort of twilight darkens, it reaches its Nightfall section, which marks the transition into the following Twilight interval. (The phrase twilight, by the way, is Previous English in origin … appropriately sufficient for a time period describing visible obscurity, it’s unclear what the prefix “twi” really means; the phrase might imply, “half gentle.”)