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Daytime length or daytime duration is the time elapsed between beginning and end of the daytime period. Given that Earth's own axis of rotation is tilted 23.44° to the line perpendicular to its orbital plane, called the ecliptic, the length of daytime varies with the seasons on the planet's surface, depending on the observer's latitude.
The length of the day (LOD), which has increased over the long term of Earth's history due to tidal effects, is also subject to fluctuations on a shorter scale of time. Exact measurements of time by atomic clocks and satellite laser ranging have revealed that the LOD is subject to a number of different changes.
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Day County Native Vegetation Pie Chart New Wiki Version: Image title: Savanna Soils of Day County South Dakota: Author: Steve Nelson: Software used: Microsoft® Word 2013: Conversion program: Microsoft® Word 2013: Encrypted: no: Page size: 792 x 612 pts (letter) Version of PDF format: 1.5
DAYS 13-15: Plank variations (mountain climbers, push-ups, and side planks)— 20 seconds on, 10 seconds rest, for 2 sets DAYS 16-30: Advanced plank variations (side planks, planks with shoulder ...
Diagram of day length affecting the phase relation between the two oscillators E and M and an actogram of a diurnal animal’s activity. Less light (short day) results in overlap of the two oscillators’ outputs, with a small phase difference, and thus, one bout of activity.