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APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Tue Jul 17, 2018 4:11 am
by APOD Robot
Moon and Venus over Cannon Beach
Explanation: What's that spot next to the Moon?
Venus. Two days ago, the crescent Moon slowly drifted past Venus, appearing
within just two degrees at its closest. This
conjunction, though, was just one of several photographic adventures for our Moon this month (
moon-th), because, for one, a partial solar eclipse occurred
just a few days before, on July 12. Currently, the Moon appears to be brightening, as seen from the Earth, as the fraction of its face illuminated by the Sun continues to increase. In a few days,
the Moon will appear more than half full, and therefore be in its
gibbous phase. Next week the face of
the Moon that always faces
the Earth will become, as viewed from the Earth, completely illuminated by
the Sun. Even this full phase will bring an adventure, though, as a total eclipse of this
Thunder Moon will occur on July 27. Don't worry about
our Luna getting tired, though, because she'll be new again next month (moon-th) -- August 11 to be exact -- just as she causes another partial eclipse of the Sun. Pictured,
Venus and the Moon were captured from
Cannon Beach above a rock formation off the
Oregon (
USA) coast known as
the Needles. About an hour after this image was taken, the spin of the Earth caused both
Venus and the Moon to
set.
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Tue Jul 17, 2018 5:45 am
by alter-ego
APOD Robot wrote: ↑Tue Jul 17, 2018 4:11 am
... within just two degrees at its closest.
That's not right. The moon (center) / Venus separation was just within 0.7°. Less than 1° is evident just looking at the image.
So, as seen from the West Coast, which this image is, the minimum separation approaches 1/2°. On the East Coast, the minimum visible separation is 2°. Location, location, location.
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Tue Jul 17, 2018 9:52 am
by Boomer12k
Here in beautiful Oregon...
:---[===] *
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Tue Jul 17, 2018 1:09 pm
by Chris Peterson
alter-ego wrote: ↑Tue Jul 17, 2018 5:45 am
APOD Robot wrote: ↑Tue Jul 17, 2018 4:11 am
... within just two degrees at its closest.
That's not right. The moon (center) / Venus separation was just within 0.7°. Less than 1° is evident just looking at the image.
So, as seen from the West Coast, which this image is, the minimum separation approaches 1/2°. On the East Coast, the minimum visible separation is 2°. Location, location, location.
Maybe some confusion with the previous night's conjunction, when the Moon and
Mercury were just two degrees apart?
_
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Tue Jul 17, 2018 3:22 pm
by neufer
Chris Peterson wrote: ↑Tue Jul 17, 2018 1:09 pm
alter-ego wrote: ↑Tue Jul 17, 2018 5:45 am
APOD Robot wrote: ↑Tue Jul 17, 2018 4:11 am
... within just two degrees at its closest.
That's not right. The moon (center) / Venus separation was just within 0.7°. Less than 1° is evident just looking at the image.
So, as seen from the West Coast, which this image is, the minimum separation approaches 1/2°. On the East Coast, the minimum visible separation is 2°. Location, location, location.
Maybe some confusion with the previous night's conjunction, when the Moon and
Mercury were just two degrees apart?
- More likely: a computer program was used that doesn't take into account the fact
that the position of the Moon varies by ±1º depending upon one's position on Earth.
Who are you going to believe: a computer program or your own eyes
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Tue Jul 17, 2018 3:36 pm
by RJN
alter-ego wrote: ↑Tue Jul 17, 2018 5:45 am
The moon (center) / Venus separation was just within 0.7°.
This oversight has now been fixed on the main NASA APOD. Thanks!
- RJN
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Wed Jul 18, 2018 12:21 am
by heehaw
Whew!
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Wed Jul 18, 2018 2:46 am
by neufer
RJN wrote: ↑Tue Jul 17, 2018 3:36 pm
alter-ego wrote: ↑Tue Jul 17, 2018 5:45 am
The moon (center) / Venus separation was just within 0.7°.
This oversight has now been fixed on the main NASA APOD. Thanks!- RJN
- He "realized there was some need for clarification" about his remarks
when he had said the words 'two degrees' instead of 'one degree'
but at least we can all be thankful that "THERE WAS NO COLLISION "
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Wed Jul 18, 2018 4:38 am
by alter-ego
neufer wrote: ↑Tue Jul 17, 2018 3:22 pm
Chris Peterson wrote: ↑Tue Jul 17, 2018 1:09 pm
alter-ego wrote: ↑Tue Jul 17, 2018 5:45 am
That's not right. The moon (center) / Venus separation was just within 0.7°. Less than 1° is evident just looking at the image.
So, as seen from the West Coast, which this image is, the minimum separation approaches 1/2°. On the East Coast, the minimum visible separation is 2°. Location, location, location.
Maybe some confusion with the previous night's conjunction, when the Moon and
Mercury were just two degrees apart?
- More likely: a computer program was used that doesn't take into account the fact
that the position of the Moon varies by ±1º depending upon one's position on Earth.
Based on the 2018 astronomical calendar link, what explains this disconnect the best (and without an erroneous computer program) is that geocentric coordinates are used. Though not as practical for lunar positions because of the relatively large parallax earthlings can easily see, geocentric coordinates do provide an accurate, valid description.
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Wed Jul 25, 2018 6:19 pm
by C A Bruce
What am I missing??
If this is the Oregon coast, and I see water, then I'm looking west. Correct???
I see Venus, and I see a full moon... How can I see a FM right after sunset...
Was a special lens, filter, or some other magical photog device used???
Inquiring minds find this odd...
I have been watching APOD for many years and find it fascinating and quite
educational.
Thank you, Robert N. and all who help make this site available to us..
Best wishes C A Bruce (WP2N)
Re: APOD: Moon and Venus over Cannon Beach (2018 Jul 17)
Posted: Wed Jul 25, 2018 7:03 pm
by bystander
C A Bruce wrote: ↑Wed Jul 25, 2018 6:19 pm
What am I missing??
If this is the Oregon coast, and I see water, then I'm looking west. Correct???
I see Venus, and I see a full moon... How can I see a FM right after sunset...
It's not full. It's a waxing crescent, just before first quarter. The full moon occurs on July 27th.