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Interesting to look at tables for (say) Pontianak (virtually on the Equator). Easy enough to see that the sunrise (or sunset) times follow the equation of time - so vary by about 30 minutes over the cycle. Slightly more challenging to explain the small but significant changes in astronomical daylight length over the year.
Interesting to look at tables for (say) Pontianak (virtually on the Equator). Easy enough to see that the sunrise (or sunset) times follow the equation of time - so vary by about 30 minutes over the cycle. Slightly more challenging to explain the small but significant changes in astronomical daylight length over the year.
The sun angle varies over the year and is highest at the equinoxes and lowest at the solstices. A lower sun angle means the sun rises and falls slower allowing for longer twilight.
The sun angle varies over the year and is highest at the equinoxes and lowest at the solstices. A lower sun angle means the sun rises and falls slower allowing for longer twilight.
My wording was bad - meant "day length", not "daylight length". But it is correct that the slight variations in P's day length are in tune with the varying solar day length contribution from the obliquity of the ecliptic (+/- 20.3 seconds).
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