Astronomy

Effect of the absence of atmospheric refraction to sun rise and sunset times

Effect of the absence of atmospheric refraction to sun rise and sunset times


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What is the effect of absence of atmospheric refraction on sin rise and sunset time? Is it will be delayed or earlier for sunrise and sunset, and why? Thank you:)


The simple answer is that atmospheric refraction makes the disk of the sun visible at sunrise or sunset, when it's actually half a degree or so below the horizon:

In reality, both the extent of refraction of the sun's disk and the refraction of the apparent horizon come into play. Both depend on the atmosphere's density and temperature profile; which changes irregularly. That makes it impossible to predict exact sunrise or sunset times when there is an atmosphere.


Watch the video: Advanced sunrise u0026 delayed sunset (November 2022).