Originally posted by CherubBaby
reply to post by Soylent Green Is People
Well it hasn't set yet. In fact its far from setting. But do you mind commenting on my PS question? What do you think science and observation have
in common? I am just curious if you need to look that up or do you already have an answer?
Science makes observations, then attempts to explain those observations in a manner that is repeatable and/or predictable.
In this case, if a person can understand the relationship among the Moon, the Earth's tilt, and the location on Earth of the observer, then that
person can repeatedly predict how the Moon will look to an observer anywhere on earth at any given moment.
In addition, science's understanding of these things -- the Moon's orbit and the Earth's tilt -- were also known through observations, thousands
of years of observations.
And science in this case CAN repeatedly predict what the moon will look like from a given location on Earth on a given day. The science to predict
this has been known for hundreds of years. Science 100 years ago had all of the knowledge necessary to predict that the Moon would look about 15+
degrees away from being horizontal while it was setting as seen from the location of Las Vegas on November 4, 2011.
...and while we are answering questions, you never answered my question based on this graphic (this is not the same graphic I used before to ask the
question; it has been changed a bit):
As shown on this graphic, the equator on a November night
can be tilted about 20° southward BELOW the ecliptic. Therefore, the moon at night
would NOT look perfectly horizontal from the equator, but rather from a point about 20° NORTH of the equator (at 20° north latitude), since that is
the part of the Earth that would be aligned with the ecliptic.
Here is my question: If the Moon can look perfectly horizontal from about 20° north latitude (about the location of Mexico City) on a November
night, then why can't it look like your picture in the OP (tilted about 15°+ away from being horizontal), which was taken from 36° north latitude
-- the location of Las Vegas?
My graphic above is simplified for the purposes of this discussion. In reality, the Moon does not lie exactly along the ecliptic plane. However,
this is accurate enough to serve as an adequate "proof of concept"
The way I have always understood it, and the way this graphic shows it, the setting crescent Moon when seen at night would look tilted (right side
lower than the left) when viewed from the equator starting in November and through the winter, would look horizontal from a point North of the equator
as far north as at least 20° North latitude (and even a bit farther North than that).
Here's the question again, but worded a bit differently:
If you agree that it is normal for the Moon at times to look horizontal when viewed from 20° North latitude, then doesn't it seem logical that 16°
farther north than 20° (at 36° North latitude), the Moon could look heavily tilted -- say about 16°+/- away from being horizontal, like in your OP
If you disagree with the idea that it is normal for the Moon to be perfectly horizontal at times when seen from 20° north latitude, or disagree with
my graphic, then please explain your disagreement.