4/9/2020 nice Prom on limb
- Ben Cartwright SASS
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4/9/2020 nice Prom on limb
There is a nice prom on the northwest limb (upper left) (I can never remember if East is right or left on the sun)
Of course there is, that is why it is going to be cloudy until next Tuesday
Of course there is, that is why it is going to be cloudy until next Tuesday
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Re: 4/9/2020 nice Prom on limb
raben.com says East is left.
but aye, I get confused, too!
but aye, I get confused, too!
Just call me Geoff....
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Re: 4/9/2020 nice Prom on limb
The last time I was on the sun I forgot which way the sun came up... ROFL
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"Sometimes having is not so pleasing as wanting, it's not logical but it is true"
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Re: 4/9/2020 nice Prom on limb
Ben Cartwright SASS wrote: ↑Thu Apr 09, 2020 11:42 am (I can never remember if East is right or left on the sun)
I always remember it by if you look at the sun (never look at the sun!) in the middle of the day then East will be to the left of you and West will be to the right. (I've never been to the southern hemisphere!) What I don't understand is why the Moon has to be the other way round!
Regards
Graeme
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- Altocumulus
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Re: 4/9/2020 nice Prom on limb
But why does it follow that convention? Anyone shed any light on it?
Just call me Geoff....
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I do what I do because I can, and because I want to.
It doesn't mean I know what I'm doing
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Re: 4/9/2020 nice Prom on limb
From Astronomy.com
For more than 350 years, cartographers drew lunar maps showing the edge of the Moon that was nearest the eastern horizon as the eastern limb. For north and south, they adopted the traditional naked-eye orientation, with north up.
In 1961, Commission 16 of the International Astronomical Union determined that there should be two types of lunar maps: those intended for exploration (think astronauts) and those intended for use at the telescope. The first type labels east in the same direction as Mare Crisium (Sea of Crises). As we gaze at the Moon when it lies highest in the south, that feature lies near the right edge. So, for the past 57 years and on into the future, east is to the right, just as all terrestrial maps label it.
The second type, telescopic maps, show south up, as it would be in a telescope that inverts the image. This type of map doesn’t carry any “east” or “west” directions.
The direction east is to the right on maps of all other objects in the solar system except one: the Sun. For whatever reason, astronomers have never changed the convention of labeling directions on the face of our daytime star. This means that, for maps dated post-1961, the Sun is the only solar system body on which a “north up” map will have east to the left.
Just call me Geoff....
I do what I do because I can, and because I want to.
It doesn't mean I know what I'm doing
I do what I do because I can, and because I want to.
It doesn't mean I know what I'm doing
- Ben Cartwright SASS
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Re: 4/9/2020 nice Prom on limb
Not only are solar heads weird but the directions on the sun are as well
I might not always be right but I am never wrong, once I thought I was wrong, but I was mistaken...
Ferengi Rule of Acquisition #59
Free advice is seldom cheap
"Sometimes having is not so pleasing as wanting, it's not logical but it is true"
Commander Spock
Canon DSLR's R7, R6II, 5D, 7D2, 90D 21 lenses incl. 100-400L mk ii, 70-200L mk iii f/2.8, RF600/11
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Ferengi Rule of Acquisition #59
Free advice is seldom cheap
"Sometimes having is not so pleasing as wanting, it's not logical but it is true"
Commander Spock
Canon DSLR's R7, R6II, 5D, 7D2, 90D 21 lenses incl. 100-400L mk ii, 70-200L mk iii f/2.8, RF600/11
Lunt LS50 DS, LS80 DS, Lunt 102ED, Stellarvue SV80 APO, Orion ST80, 127 MAK, Skywatcher Evostar 120ED, 102 MAK, Celestron 8" Edge HD, 102AZ
Skywatcher EQ6-R Pro
ZWO ASI071MC-cool, ASI174mm, ASI174mm-cool, ASI178MC-cool, ASI290 mini, ASI120MM-S, ASI120MC Revolution Player One mm (178 chip)
- Altocumulus
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Re: 4/9/2020 nice Prom on limb
Indeed!
It doesn't make it any less confusing, though....
I think best way to tackle it is to accept Up is North, then the East / West configuration is the opposite of what we when we look at the Earth.
It doesn't make it any less confusing, though....
I think best way to tackle it is to accept Up is North, then the East / West configuration is the opposite of what we when we look at the Earth.
Just call me Geoff....
I do what I do because I can, and because I want to.
It doesn't mean I know what I'm doing
I do what I do because I can, and because I want to.
It doesn't mean I know what I'm doing
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