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We know that a day is actually 23 hours 56 minutes and 4 seconds long. That means If sunrises at 6 a.m this morning, tomorrow it will rise at about 4 minutes earlier. In two month the sun will rise 4*60 minutes= 4 hour earlier, i.e at 2 a.m. It is unusual, so something must be wrong!
What is the flaw in the above analysis?

2007-02-16 21:25:31 · 5 answers · asked by Anonymous in Science & Mathematics Mathematics

But we have never seen the sun to rise at 2 a.m (at midnight!!? hehee........).

2007-02-16 22:04:06 · update #1

5 answers

I think you can find this answer in any almanac.

The average Solar day ( as defined by the position of the sun relative to our position on earth) is defined precisely 24.00 hours.
Expressed another way, the hour is defined as precisely 1/24 of the
average solar day.

What you refer to above is the Sidereal day which is not considered
in our daily language. This Sidereal day is the average time (in Solar
hours and minutes) for an arbitrary distant reference star to apparently
turn in the "celestial sphere" once around the earth.

So, it is not the sun that rises earlier each day, but an arbitrary reference star in reference to the sun.

In fact, 365 solar days = approx 366.25 sidereal days.

(It's the .25 that makes us add a leap-day every 4 years to "keep the
sun and solar calendar in synch with the seasons")

2007-02-17 00:30:24 · answer #1 · answered by Hk 4 · 0 0

Time is an arbitary thing assigned to the movement of the sun and fixed to its zenith position so in the summer the angle of the earth causes greater exposure and therefore earlier rising and later setting however as the season changes the sun then sets later in the morning and earlier in the evening. Simple

2007-02-17 05:37:42 · answer #2 · answered by minihitler 2 · 1 0

it will actually rise 3 minutes and 56 minutes earlier tommorow.
That's the flaw.

2007-02-17 11:52:29 · answer #3 · answered by Anonymous · 0 0

there aint no flaw.....

its just that our clocks dont know abt subtarcting 3 minutes and 56 seconds every day.....

2007-02-17 05:48:23 · answer #4 · answered by nUssie.. 2 · 0 0

the fact you were thinking about it.
nah its cos we got a 24 hour clock so it won't matter.
Guy below me don't take it too seriosly....

2007-02-17 05:36:49 · answer #5 · answered by P4BZ 4 · 0 0

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