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I've been meaning to find a correction method for the true location of the sun so when I add the correction to the true sun it would give me the apparent sun. To clarify, I want to be able to calculate the difference of time between sunsets or sunrises if:

There were no geographical formations whatsoever, elevated or depressed, the entire planet being a perfect geoid in that case (observer's altitude would contribute to day length for increased height would move the horizon further away from the observer, allowing him to observe the sun longer),

There was no refraction of light (that would probably be comparable to having no atmosphere),

The sun was a point light source (a necessary comparison to compensate for the angular radius of the sun)

The parallax of the sun, however minute, did not contribute to the difference of time (the angle that the Earth's equatorial radius would subtend if observed from the center of the Sun)

And sunrises and sunsets if the four above-mentioned factors were as they are on our planet Earth. I know the question is phrased a bit noobish but it's been several years since I've graduated from Astronomy department and haven't studied since and all of a sudden I'm required to know the difference between these two situations. Please help me out here, how do I compensate for these factors?

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# Sunrise and sunset correction for astronomical and geographical factors

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