Apparent Solar Motions from Earth

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Presentation transcript:

Apparent Solar Motions from Earth i.e. how the sun appears to move.

The sun is NEVER directly overhead in WNY. Ever.

But wait… where could this be? Only at the equator and only around the equinoxes

How ‘bout this? But where could this be? When? NO.

This would be somewhere further north on the equinoxes. Could this ever be WNY? Not really. This would be somewhere further north on the equinoxes.

How ‘bout now? Still, no. This would be somewhere further SOUTH on the equinoxes.

This is approximately us in NY What is solar noon?

To calculate the height of the sun at local noon… Equinoxes: solar altitude at noon = 90° - latitude = 90° - 43° = 47° above horizon at local noon Summer solstice = 90° - latitude + 23.5° = 70.5° Winter solstice = 90° - latitude - 23.5° = 23.5°

Year Vernal Equinox Summer Solstice Autumnal Equinox Winter Solstice 2017 Mar 20 6:28 am EDT Jun 21 12:24 am EDT Sep 22 4:01 pm EDT Dec 21 11:27 am EST 2018 12:15 pm EDT 6:07 am EDT 9:54 pm EDT 5:22 pm EST 2019 5:58 pm EDT 11:54 am EDT Sep 23 3:50 am EDT 11:19 pm EST 2020 Mar 19 11:49 pm EDT Jun 20 5:43 pm EDT 9:30 am EDT 5:02 am EST 2021 5:37 am EDT 11:32 pm EDT 3:21 pm EDT 10:59 am EST 2022 11:33 am EDT 5:13 am EDT 9:03 pm EDT 4:48 pm EST

Some fun Regents Questions… Not all of these are on the handout…