Originally posted by Shdak
Originally posted by SunnyDee
I hate to sound silly, but my home that I've been in 12 years, seems different too. The backyard faces north. The house casts a shadow on the back
patio as normal at this time of year, but this year it seems to extend out farther from the house,(the shadow), I can tell when the grass closest to
the house dies back, we're in the short days of the year. I will have to see if the grass has died back farther than usual, (I really doubt it!), but
I would think if there were some change in axis, and the sun is now moving across at a more southerly latittude, my grass will show it.
Will check tomorrow.
I agree with you the sunrise and sunset are the same, but the shadows are much longer...I have noticed this for weeks.
If the sunrise and sunset times are the same as expected-- than the ONLY way the shadows could be longer is if the axis of the earth's rotation has
changed as regards the position of the sun-- and thus, also changed in relation to the stars and the planets.
There is no other alternative.
1) Take the shade off a lamp and turn lamp on to represent sun.
2) Get a basketball to represent to represent the earth.
3) Hold basketball, choosing the valve to be the North Pole.
4) Tape a short object to a fixed spot on ball to provide a shadow to measure.
5) Rotate ball so that valve stays at top and observe shadow.
6) Reason out how the "Noon" shadow falls to the same lengths for each rotation.
7) If the spin is constant like the sunrise and sunset being predictable, then,
8) The only way to lengthen a shadow on any fixed point is to tilt the valve back away from, or forward and toward, the lamp= changing the axis of
rotation.
Yo do not really need to perform the experiment-- you can merely visualize it. And it is a good visualization exercise.
Now if you move the taped object where a shadow is measured "north" or "south"-- the shadow will change, but not the axis of rotation.
So, the only options which remain to us are that the OP was incorrect in his observation or that the OP has changed latitude since prior observations.