You'll likely catch this image a million times in your various feeds: Earth as seen by Reid Wiseman from Artemis II en-route to the Moon.
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@markmccaughrean What do you mean by the bright limb at lower-left?
@saarmuller I mean that that's a typo – the limb at lower-right. Ugh – will edit.
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@saarmuller I mean that that's a typo – the limb at lower-right. Ugh – will edit.
@markmccaughrean Right!
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@markmccaughrean And also, I think that is where the day ends (the north pole is at the bottom), very confusing.
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You'll likely catch this image a million times in your various feeds: Earth as seen by Reid Wiseman from Artemis II en-route to the Moon.
My first thought? That's *really* noisy 🧐
But then I realised – it's the *nightside* of Earth, illuminated by the almost full Moon, not the Sun
The bright limb at lower-right is where the dayside starts, & the fact that you can see aurorae, airglow, & cities in Europe, Africa, & S & N America also gives the game away.
Cool.
@markmccaughrean you can see the lights of the cities, yes
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You'll likely catch this image a million times in your various feeds: Earth as seen by Reid Wiseman from Artemis II en-route to the Moon.
My first thought? That's *really* noisy 🧐
But then I realised – it's the *nightside* of Earth, illuminated by the almost full Moon, not the Sun
The bright limb at lower-right is where the dayside starts, & the fact that you can see aurorae, airglow, & cities in Europe, Africa, & S & N America also gives the game away.
Cool.
@markmccaughrean Tech details: Nikon D5 at ISO 51200, 1/4 sec exposure.
(Thanks for posting - I'm out of the house and didn't post it because I couldn't write an alt text)
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@markmccaughrean And also, I think that is where the day ends (the north pole is at the bottom), very confusing.
@saarmuller The poles are where the aurorae are, broadly speaking, at upper-right & lower-left, so the terminator is more or less north-south, a little biased north, as you’d expect a couple of weeks after the equinox.
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@markmccaughrean you can see the lights of the cities, yes
@mdione Waving at my friends in Lisbon & Madrid
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@markmccaughrean Tech details: Nikon D5 at ISO 51200, 1/4 sec exposure.
(Thanks for posting - I'm out of the house and didn't post it because I couldn't write an alt text)
@russss That’s a decent handheld shot for 1/4 sec, even with image stabilisation – maybe he was leaning against the window
Still, ISO 51200 is cooking 
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@russss That’s a decent handheld shot for 1/4 sec, even with image stabilisation – maybe he was leaning against the window
Still, ISO 51200 is cooking @markmccaughrean DSLRs still deliver the goods!
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@saarmuller The poles are where the aurorae are, broadly speaking, at upper-right & lower-left, so the terminator is more or less north-south, a little biased north, as you’d expect a couple of weeks after the equinox.
@markmccaughrean What I mean is: the bright rim is on the westside, so the end of the day, not the start of dayside. What am I missing?
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@markmccaughrean DSLRs still deliver the goods!
@russss Which is exactly why I’m intending to upgrade from my shonky old D7000 to a D850 … I mean, I don’t need video, so do I really need to switch to a Z8?
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@markmccaughrean What I mean is: the bright rim is on the westside, so the end of the day, not the start of dayside. What am I missing?
@saarmuller Oh, in that sense – yes, it's the evening terminator at the end of the day, not the dawn terminator. Good point. I just meant is was the start of the dayside, as in where the dayside "is", not which time of day it was per se.
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@saarmuller Oh, in that sense – yes, it's the evening terminator at the end of the day, not the dawn terminator. Good point. I just meant is was the start of the dayside, as in where the dayside "is", not which time of day it was per se.
@markmccaughrean That's what I meant by "very confusing"! (Combined with the left-right error, the left WAS the start of day side, the dawn side)
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@markmccaughrean That's what I meant by "very confusing"! (Combined with the left-right error, the left WAS the start of day side, the dawn side)
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You'll likely catch this image a million times in your various feeds: Earth as seen by Reid Wiseman from Artemis II en-route to the Moon.
My first thought? That's *really* noisy 🧐
But then I realised – it's the *nightside* of Earth, illuminated by the almost full Moon, not the Sun
The bright limb at lower-right is where the dayside starts, & the fact that you can see aurorae, airglow, & cities in Europe, Africa, & S & N America also gives the game away.
Cool.
@markmccaughrean uh... I thought that was South Australia and Tasmania
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@markmccaughrean uh... I thought that was South Australia and Tasmania
@ranx Am pretty sure that's North Africa, then Spain & Portugal on the left-hand side, with South America at right, & North America at lower-right.
Worth remembering that they were probably still pretty close to Earth when this was taken, so even though it's round, it's quite heavily "distorted" by perspective, as the nadir point is quite a bit closer to them than the limbs.
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@ranx Am pretty sure that's North Africa, then Spain & Portugal on the left-hand side, with South America at right, & North America at lower-right.
Worth remembering that they were probably still pretty close to Earth when this was taken, so even though it's round, it's quite heavily "distorted" by perspective, as the nadir point is quite a bit closer to them than the limbs.
@markmccaughrean oh right! Now that I flipped the phone I can see the shape of Spain!
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You'll likely catch this image a million times in your various feeds: Earth as seen by Reid Wiseman from Artemis II en-route to the Moon.
My first thought? That's *really* noisy 🧐
But then I realised – it's the *nightside* of Earth, illuminated by the almost full Moon, not the Sun
The bright limb at lower-right is where the dayside starts, & the fact that you can see aurorae, airglow, & cities in Europe, Africa, & S & N America also gives the game away.
Cool.
@markmccaughrean I love the skim of atmosphere, particularly where it's not so bright.
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@markmccaughrean I love the skim of atmosphere, particularly where it's not so bright.
@Azuaron That thin airglow layer at around 80km is really important in ground-based astronomy.
It's particularly bright in the infrared, dominating the background for near-IR observations, but it's also where the sodium atoms are that are used to create laser guide stars for adaptive optics.
Swings & roundabouts
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You'll likely catch this image a million times in your various feeds: Earth as seen by Reid Wiseman from Artemis II en-route to the Moon.
My first thought? That's *really* noisy 🧐
But then I realised – it's the *nightside* of Earth, illuminated by the almost full Moon, not the Sun
The bright limb at lower-right is where the dayside starts, & the fact that you can see aurorae, airglow, & cities in Europe, Africa, & S & N America also gives the game away.
Cool.
I thought to myself... Duh!
Thanks for the insight. Photo is much more impressive now.
