A star rises at 8 pm tonight. At what time will it rise after a month? Why?
Answers
The star will rise at 6 o'clock,.or 2 about hours earlier.it depends on how many days are in the month.& here is how you figure this out,..imagine that you are looking down, upon the sun, & the earth, from high above the north pole,..You would see the earth going around the sun in a "counter clockwise' direction,..this take 1 year,..& you would see the Earth spinning in it,s axis, .in a "counter clockwise" direction,..(it might help to draw a little diagram of this,] draw a small circle in the middle of a piece of paper,this is the sun, then draw a larger circle around the sun,..this is the path that the earth follows around the Sun, taking 1 year,..now, divide that circle into 12 parts,..It will take the Earth about 1 month, to cover each of thse 12 parts,..now draw a circle, representing the Earth, on any 2 two lines, that are 1 month apart,.. of the now "shade the half of the Earth that is away from the Sun a dark color, that is the night half of the Earth, .now draw a little line protruding out from the night side, of the Earth,..directly opposite the sun, this is you,..at midnight,..Lets say on January first,.do the same, to each of the two, Earths,the other Earth, will be February first ,..now draw a few stars, all around the edges of the paper,..now back to "you" standing on the earth at midnight,..you are looking East,..that is, you are looking in the direction that the Earth is spinning, on January First..Now , pick a star, in the direction in which you are looking,..let us say, that this star is rising,..at midnight,.. now draw a line, from "you', to that star,..Now go to the February, position,.draw a line,..notice that tha angle has changed in that the star is higher,or closer to being overhead, at midnight,..& since the Earth has gone,..in 1 months time, 1/ 12, of the way around the Sun, the the star has risen, 1/12 of the day earlier,..or,about 2 hours earlier Now if you go to the April first, position, you will see that the star is directly over your head at midnight,,& if you go to the July first position you find the star setting at midnight, & if you go to October first, the star will be on the other side of the Sun, at midnight,..so you won't even be able to see it & on January first,..it will rise again, at midnight,..In short,..to determine, how much earlier a star will rise over any given period of time,..you determine the fraction, or the percentage, of a year that is involved,.& the star will rise that SAME, fraction , or percent of a Day,..For instance, to determine how much earlier a star will rise in 1 day,.it being that 1 day is 1/365 of a year,.you divide the number of minutes in a day by 365,..So there,..isn't that easy,..