Difference in Daytime and Nighttime Stars:

Posted by khuram on March 18, 2011

Daytime and Nighttime Stars:

I just google searched to see some information about any possible difference between Daytime and Nighttime sky but first few pages however could not satisfy my query. So here I am writing down my understanding of the issue. First of all there must be stars in Daytime. Secondly, those stars must be different from those what we observe in Night Sky.

Why there must be stars in Day Sky?

Well, I never have seen. I read somewhere that stars are visible in daytime from deep vertical coal mines. I also heard/read that stars become apparent during complete solar eclipse etc. Apart from these reasons, sun is also a star and is visible in daytime.

Why Nighttime stars should be different from those what we observe in Night Sky?

As we cannot see The Sun in the night sky, so we should not be able to see other objects of Day Sky at Nighttime. The Sun is above of us at Daytime but it is beneath of us in Nighttime. So other Daytime fixed objects (stars) also should be beneath of us at Nighttime.

At Night, we see those things which were beneath of us at Daytime. This is very simple position. I do not know the official position of Science on this issue. I may be wrong but this is what I can understand at my own.

Update on April 27, 2011:

Last night I observed apparent movement of ‘fixed stars’ in sky. Today I google searched to see details of movements of stars. What I learn is that stars, just like sun, also rise in east and set in the west.

Following web page discusses this thing:

So if Stars also change positions like sun, then obviously daytime stars are different from nighttime stars.


6 Responses to “Difference in Daytime and Nighttime Stars:”

  1. Many difference day and night a simple difference is day time sun Shaine and night time moon, day time we work very easy and night time light is very low.

  2. khurram said

    Are you serious? You think that people who validated General Theory of Relativity made an elementary mistake like this?

    The solar system is 3-dimensional. Not 2-dimensional. Stars are do not have to be on the same plane as the earth-sun plane. Given the small size of the earth relative to the sun and the tilt in its axis it is easy to draw diagrams to show that most stars can be seen both at nighttime and daytime. Try it.

    • khuram said

      Khurram …

      After knowing zodaic signs in detail and realizing that Tauras is a Zodaic constellation … and thay in may .. when experiment was performed … daytime position of tauras and sun matches … so i have deleted the controvertial part of this article.


  3. khuram said


    Yes I am serious. Yes it is quite possible to draw full diagram of all the star positions. But point is that those experimenters did not compare observed position with standard diagram. They only compared eclipse time position of observed star with night time position.

    See Prof. Daniel Kennefic words:

    [quote] The method used to determine the apparent shifts was
    to expose pictures of the star field during the eclipse and then
    take comparison exposures of the same star field at night,
    without the Sun present.[/quote]

    If at night time, we cannot see sun near taurus constellation, then how on day time we can see sun near taurus constellation. Actually sun is near a daytime “xyz” constellation. At night … sun will remain near that “xyz” constellation. Only thing will be that neither we will be able to see sun nor that “xyz” constellation. At daytime complete solar eclipse, however we will be able to see a dark sun near somewhat bright “xyz” constellation.

    Now fact is that those experimenters have compared position of “xyz” contellation with the position of “taurus” constellation. They found that “xyz” constellation stars at somewhat different positions. And they announced victory of General Relativity.

    For other relativity aspects, please check my following post:

    • rossws said

      Stars at night are also visible by day, the Earth is part of the Solar System (rotating around the sun) the other stars that we see are not rotating around the sun, the Earth is continually rotating on it’s own axis the stars that are visible in the day should be no different to those visible at night (albeit it at different times of the year). Although I understand the angle we view them would be different.

      This is just using my logic so feel free to comment back or explain it differently to me incase I am not understanding your point correctly.

      • khuram said

        Thanks for your points. Actually now I often note apparent movement of stars on night sky. many stars on extreme west are set within hour or so. Stars which are on west but not extreme west may take 2-3 hours to set and disappear. Stars which are overhead at start of night are set after midnight. So there is no reason to believe that daytime sky, if dark, would show same stars as we see in night. Just like many stars are set in west over the course of night, so many stars rise in east in that same course of time.

        Secondly … Spin of earth would have same effect on visiblity of sun as with other stars. But rotation of earth around sun would have unique effects with sun which will not be with other stars.

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