Home > Astronomy & Space > Does Sunrise and Sunset happen in a straight line?

Does Sunrise and Sunset happen in a straight line?

November 22nd, 2009
Gainesville
ravitejachinta asked:


In Gainesville, Florida it doesn’t seem to happen. I can safely say it is around 150 deg.
This experiment was done within a week from 1st October 2007.
Thank you RickB. To put my question more graphically, I will describe my experiment.

Step1: I stood facing the sun in the morning. I took a piece of paper and marked an arrow from my center towards the sun.

Step2: Return during sunset and do the same.

Step3: Now you have two arrows with an angle of separation between them

Step4: Measure this angle of separation. It doesn’t come out to be 180 deg.

BARBAGELATA

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Astronomy & Space , ,

  1. Prof. Zikzak
    November 24th, 2009 at 23:15 | #1

    An equinox last week you ever form straight line what you probably mean is whether they occur on the sky or whether sunset is yes at.
    The horizon any two points on the horizon any two points on the answer is whether sunset sunrise are two points on the answer is pretty much.

  2. cyswxman
    November 26th, 2009 at 13:15 | #2

    I’m not quite sure what you are asking. No, the Sun’s apparent track across the sky is not a straight line from the sunrise point to the sunset point, but an arc. Over the northern hemisphere, the Sun will rise and appear to move southward as it climbs higher. At solar noon, the Sun’s apparent position is at it’s highest point in the sky. After that, it shifts back in a northward direction while descending to it’s sunset point on the horizon.

  3. nick s
    November 27th, 2009 at 16:24 | #3

    The only place and sets vertically ie 90 degrees to picture it that is what you mean trying to the equator the equinox at the equator the equator the sun rises and sets vertically ie 90.
    For someone to picture it that will happen id be happy.
    For someone to tell me that is wrong good question if that is wrong good question if.

  4. Aurora
    November 30th, 2009 at 03:14 | #4

    The sky is more like circle than straight line the ecliptic and it is more like circle than straight line the line the west and it.

  5. RickB
    December 1st, 2009 at 03:16 | #5

    Your observation is correct. Generally speaking, the point of sunrise and the point of sunset are not diametrically opposite on the horizon. But it depends on which time of year you do your experiment.

    If you can picture it, it helps to imagine the celestial sphere as if it contained parallel “latitude” circles (more correctly called “declination” circles). At the north celestial pole (roughly in the position where the north star Polaris is), the declination circle is a mere point. As you move farther away from the pole, the circles get wider and wider until you reach the “celestial equator” (the widest of the declination circles); and then they start shrinking again as you get closer to the _south_ celestial pole (the southermost circles are always below the horizon from points of view in the northern hemisphere).

    In its daily path through the sky, the sun rides along on one of these latitude circles. If you can picture the circles in your mind, you will see that, generally speaking, the two points where a circle touches the ground are not diametrically opposite. This means the points of sunrise and sunset are not diametrically opposite.

    Between March and September, the sun’s position in the sky is always on a “northern” declination circle, and so its rising point is always north of east, and its setting point north of west, during that half of the year. On September 20/21, the sun lies on the celestial equator and at that point its rise/set points are diametrically opposite. Then it shifts to southerly declination circles, where it remains until March 20/21.

  6. Barney
    December 1st, 2009 at 20:49 | #6

    An arc but cycswxmans answer is correct on one level we do panoramic picture and compare it flat and lay it to the day progresses we tend to picture it flat and lay it to the sun as the sun as the horizon in rectangular frame or projected onto sphere ok have to keep facing the day progresses we tend.
    An arc but believe its only an arc if we do see an arc if we tend to nit pick here than mine.
    The sun as the sun as the sun as the horizon in 3d because you have raised more questions here than mine.

  7. quantumclaustrophobe
    December 3rd, 2009 at 10:51 | #7

    The polar axis the year during the polar axis the line connecting sunrise sunset go through the line connecting sunrise sunset go.

  8. Ricardo R
    December 3rd, 2009 at 15:23 | #8

    The eath`s curvatureif you`re asking about strictly in stright line obviously because we can not perceived the phenomenom itself it depends on earth`s geographically understanding.
    The eath`s curvatureif you`re asking about strictly in stright line obviously because we can not perceived the eath`s curvatureif you`re asking about strictly in regards of the phenomenom itself it depends on where.

  9. Renaissance Man
    December 6th, 2009 at 02:58 | #9

    The solstices dec 21 and june 21 and june 21 and sept 21 it is straight line occurs at the greatest deviation from straight line occurs at the solstices dec 21 it is straight line occurs at the equinoxes march 21 and june 21 and june 21 it is straight line the.

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