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Would the Real ‘SuperMoon’ Please Stand Up?
universetoday.com ^ | July 8, 2014 | David Dickinson on

Posted on 07/08/2014 10:59:09 AM PDT by BenLurkin

What’s happening this summer: First, here’s the lowdown on what’s coming up. The closest Full Moon of 2014 occurs next month on August 10th at 18:11 Universal Time (UT) or 1:44 PM EDT. On that date, the Moon reaches perigee or its closest approach to the Earth at 356,896 kilometres distant at 17:44, less than an hour from Full. Of course, the Moon reaches perigee nearly as close once every anomalistic month (the time from perigee-to-perigee) of 27.55 days and passes Full phase once every synodic period (the period from like phase to phase) with a long term average of 29.53 days.

The truth is, the Moon does vary from 356,400 to 406,700 kilometres in its wonderfully complicated orbit about our fair world, and a discerning eye can tell the difference in its size from one lunation to the next. This means the apparent size of the Moon can vary from 29.3’ to 34.1’ — a difference of almost 5’ — from perigee to apogee. And that’s not taking into account the rising “Moon illusion,” which is actually a variation of an optical effect known as the Ponzo Illusion. And besides, the Moon is actually more distant when its on the local horizon than overhead, to the tune of about one Earth radius.

(Excerpt) Read more at universetoday.com ...


TOPICS: Astronomy; Science
KEYWORDS:

Moon rise on the evening of July 11th, 2014 as seen from latitude 30 degrees north. Credit: Stellarium.
1 posted on 07/08/2014 10:59:09 AM PDT by BenLurkin
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To: BenLurkin

Cool stuff.


2 posted on 07/08/2014 11:09:12 AM PDT by b4its2late (A Progressive is a person who will give away everything he doesn't own.)
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To: BenLurkin

I witnessed one of those moon-rising along the Mississippi River, near Eau Clair, WI one August.

The moon was blood-red and filled up nearly the entire sky. I was driving and had to pull over. I thought the End of the World was upon us, LOL!

I’ll never, EVER forget it and I doubt I’ll ever see anything like it ever again in my lifetime - but once was enough. It was kind of scary!


3 posted on 07/08/2014 11:15:07 AM PDT by Diana in Wisconsin (I don't have 'Hobbies.' I'm developing a robust Post-Apocalyptic skill set...)
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To: b4its2late

To a lesser degree, the Sun shows an angular size difference between its perihelion —Earth's closest approach of about 91.4 million miles, typically just after New Year's— and at aphelion (farthest away) around mid-year.

These respective views of the Sun in H-alpha filtering show the relative change during our annual elliptical orbit of Old Sol. Aphelion day for 2014 just occurred on July 3rd, at a distance of approx. 94.5M miles.

4 posted on 07/08/2014 11:24:58 AM PDT by mikrofon (Space BUMP)
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To: mikrofon

Awesome. Always loved astronomy.


5 posted on 07/08/2014 11:54:04 AM PDT by b4its2late (A Progressive is a person who will give away everything he doesn't own.)
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To: BenLurkin

Hmmmmmm, that is Friday night. Might have to kidnap She Who Must Be Obeyed and take her down to our favorite moonrise watching location.

Hope the Texas skies are clear that night!


6 posted on 07/08/2014 6:18:42 PM PDT by West Texas Chuck (Those who "try" often fail, those who DO often succeed.)
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