Dr. John Barentine FRAS
@JohnBarentine@scicomm.xyz  ·  activity timestamp 1 hour ago
Dr. John Barentine FRAS
@JohnBarentine@scicomm.xyz  ·  activity timestamp 1 hour ago
grobi
@grobi@defcon.social  ·  activity timestamp 6 months ago
grobi
@grobi@defcon.social  ·  activity timestamp 7 months ago

TOPIC>
"Stars On A Trail"

A Path North
* Image Credit & Copyright: Mario Konang

Explanation:
What happens if you keep going north? The direction north on the Earth, the place on your horizon below the northern spin pole of the Earth -- around which other stars appear to slowly swirl, will remain the same. This spin-pole-of-the-north will never move from its fixed location on the sky -- night or day -- and its height will always match your latitude. The further north you go, the higher the north spin pole will appear. Eventually, if you can reach the Earth's North Pole, the stars will circle a point directly over your head. Pictured, a four-hour long stack of images shows stars trailing in circles around this north celestial pole. The bright star near the north celestial pole is Polaris, known as the North Star. The bright path was created by the astrophotographer's headlamp as he zigzagged up a hill just over a week ago in Lower Saxony, Germany. The astrophotographer can be seen, at times, in shadow. Actually, the Earth has two spin poles -- and much the same would happen if you started below the Earth's equator and went south.

https://apod.nasa.gov/apod/ap200407.html

#space #earth #astrophotography #photography #astroart #art #science #nature #education
grobi
@grobi@defcon.social  ·  activity timestamp 7 months ago

TOPIC>
"Stars On A Trail"

Please click the post above to reveal the whole path of that thread.

https://defcon.social/@grobi/114538103004457677

This thread about Star Trails is a long trip through the photo archives of NASA and ESA. Some of you have already seen my affinity for these archives, and in threads like this one I would like to make you understand my fascination. So if you like, follow me this time on my trail in all directions back and forward in time, past beautiful, special, extreme and even magical places, through a gallery of wonderful images, provided by great often volunteer astrophotographers who are generous enough to share their love and fascination for the stars around us ..

Please visit their websites, leave friendly and encouraging comments and maybe you will even have the opportunity to support them financially or logistically. On each of my posts you can find a link to the archive pages and many of the astrophotographers leave a link there or even a mail-address

I can hardly express my great gratitude for all the magic and beauty and I sincerely hope that these archives will be available to us for a long time to come! But you never know, with the power-obsessed destructive Lunatics these days..

Anyway, I really hope you enjoy this trail with me.

Start Your Star Trail Here:
>> https://defcon.social/@grobi/114538103004457677

* Music:
The Church - Under The Milky Way

** Video Credit:
Beatriz
@Beatriz_
https://www.youtube.com/@Beatriz_

*** Thumbnail Credit:
Mario Konang from Lower Saxonie Germany

#space #earth #astrophotography #photography #astroart #art #science #nature

grobi wears a new hat with an US-shaped Pride flag embroidery and a peace sign, as well as new "John Lennon" sunglasses reflecting a well-known Planetary Nebula .. He rides the wrong way around on a laughing horse through space, accompanied by Hubble and Chandra, in the background you can see Gravity's Grin or flippantly called the Cheshire Cat galaxy group. grobi looks kind of stoned, but swears stone and bone that he has not ingested any external toxic materials. Instead, he mumbles something about Dark Matter and the distortion of the time-space continuum and that he now has more foresight.. .. and on top of all this, does he invite us on a journey through space and time??? Honestly, he had the wrong mushrooms in his lunch soup, didn't he?
grobi wears a new hat with an US-shaped Pride flag embroidery and a peace sign, as well as new "John Lennon" sunglasses reflecting a well-known Planetary Nebula .. He rides the wrong way around on a laughing horse through space, accompanied by Hubble and Chandra, in the background you can see Gravity's Grin or flippantly called the Cheshire Cat galaxy group. grobi looks kind of stoned, but swears stone and bone that he has not ingested any external toxic materials. Instead, he mumbles something about Dark Matter and the distortion of the time-space continuum and that he now has more foresight.. .. and on top of all this, does he invite us on a journey through space and time??? Honestly, he had the wrong mushrooms in his lunch soup, didn't he?
grobi wears a new hat with an US-shaped Pride flag embroidery and a peace sign, as well as new "John Lennon" sunglasses reflecting a well-known Planetary Nebula .. He rides the wrong way around on a laughing horse through space, accompanied by Hubble and Chandra, in the background you can see Gravity's Grin or flippantly called the Cheshire Cat galaxy group. grobi looks kind of stoned, but swears stone and bone that he has not ingested any external toxic materials. Instead, he mumbles something about Dark Matter and the distortion of the time-space continuum and that he now has more foresight.. .. and on top of all this, does he invite us on a journey through space and time??? Honestly, he had the wrong mushrooms in his lunch soup, didn't he?
SETI Institute
@setiinstitute@mastodon.social  ·  activity timestamp 7 hours ago
Grainy space image, with white dots on a dark background. At the center of the image is a larger, bright white blob with a faint white line stretching towards the top of the frame. The white blob is surrounded by a red circle to mark its location, while the faint line leading up is labeled "plasma tail". A second tail is highlighted in red leading down to the left and is labeled "potential dust tail". An inset image in the top left shows the location of Juice (pink) relative to the Sun (yellow) and Comet 3I/ATLAS (white).
Grainy space image, with white dots on a dark background. At the center of the image is a larger, bright white blob with a faint white line stretching towards the top of the frame. The white blob is surrounded by a red circle to mark its location, while the faint line leading up is labeled "plasma tail". A second tail is highlighted in red leading down to the left and is labeled "potential dust tail". An inset image in the top left shows the location of Juice (pink) relative to the Sun (yellow) and Comet 3I/ATLAS (white).
Grainy space image, with white dots on a dark background. At the center of the image is a larger, bright white blob with a faint white line stretching towards the top of the frame. The white blob is surrounded by a red circle to mark its location, while the faint line leading up is labeled "plasma tail". A second tail is highlighted in red leading down to the left and is labeled "potential dust tail". An inset image in the top left shows the location of Juice (pink) relative to the Sun (yellow) and Comet 3I/ATLAS (white).
SETI Institute
@setiinstitute@mastodon.social  ·  activity timestamp 7 hours ago
Grainy space image, with white dots on a dark background. At the center of the image is a larger, bright white blob with a faint white line stretching towards the top of the frame. The white blob is surrounded by a red circle to mark its location, while the faint line leading up is labeled "plasma tail". A second tail is highlighted in red leading down to the left and is labeled "potential dust tail". An inset image in the top left shows the location of Juice (pink) relative to the Sun (yellow) and Comet 3I/ATLAS (white).
Grainy space image, with white dots on a dark background. At the center of the image is a larger, bright white blob with a faint white line stretching towards the top of the frame. The white blob is surrounded by a red circle to mark its location, while the faint line leading up is labeled "plasma tail". A second tail is highlighted in red leading down to the left and is labeled "potential dust tail". An inset image in the top left shows the location of Juice (pink) relative to the Sun (yellow) and Comet 3I/ATLAS (white).
Grainy space image, with white dots on a dark background. At the center of the image is a larger, bright white blob with a faint white line stretching towards the top of the frame. The white blob is surrounded by a red circle to mark its location, while the faint line leading up is labeled "plasma tail". A second tail is highlighted in red leading down to the left and is labeled "potential dust tail". An inset image in the top left shows the location of Juice (pink) relative to the Sun (yellow) and Comet 3I/ATLAS (white).
grobi
@grobi@defcon.social  ·  activity timestamp 3 months ago
2010 March 21 Equinox + 1 * Credit & Copyright: Joe Orman Explanation: Twice a year, at the Spring and Fall equinox, the Sun rises due east. In an emphatic demonstration of this celestial alignment, photographer Joe Orman recorded this inspiring image of the Sun rising exactly along the east-west oriented Western Canal, in Tempe, Arizona, USA. But he waited until one day after the northern Spring equinox, in 2001, to photograph the striking view. Why was the rising Sun due east one day after the equinox? At Tempe's latitude the Sun rises at an angle, arcing southward as it climbs above the horizon. Because the distant mountains hide the true horizon, the Sun shifts slightly southward by the time it clears the mountain tops. Waiting 24 hours allowed the Sun to rise just north of east and arc back to an exactly eastern alignment for the photo. Today is another Equinox + 1 day, with the Sun crossing the celestial equator yesterday at about 17:32 Universal Time. Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) NASA Official: Phillip Newman Specific rights apply. NASA Web Privacy Policy and Important Notices A service of: ASD at NASA / GSFC & Michigan Tech. U.
2010 March 21 Equinox + 1 * Credit & Copyright: Joe Orman Explanation: Twice a year, at the Spring and Fall equinox, the Sun rises due east. In an emphatic demonstration of this celestial alignment, photographer Joe Orman recorded this inspiring image of the Sun rising exactly along the east-west oriented Western Canal, in Tempe, Arizona, USA. But he waited until one day after the northern Spring equinox, in 2001, to photograph the striking view. Why was the rising Sun due east one day after the equinox? At Tempe's latitude the Sun rises at an angle, arcing southward as it climbs above the horizon. Because the distant mountains hide the true horizon, the Sun shifts slightly southward by the time it clears the mountain tops. Waiting 24 hours allowed the Sun to rise just north of east and arc back to an exactly eastern alignment for the photo. Today is another Equinox + 1 day, with the Sun crossing the celestial equator yesterday at about 17:32 Universal Time. Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) NASA Official: Phillip Newman Specific rights apply. NASA Web Privacy Policy and Important Notices A service of: ASD at NASA / GSFC & Michigan Tech. U.
2010 March 21 Equinox + 1 * Credit & Copyright: Joe Orman Explanation: Twice a year, at the Spring and Fall equinox, the Sun rises due east. In an emphatic demonstration of this celestial alignment, photographer Joe Orman recorded this inspiring image of the Sun rising exactly along the east-west oriented Western Canal, in Tempe, Arizona, USA. But he waited until one day after the northern Spring equinox, in 2001, to photograph the striking view. Why was the rising Sun due east one day after the equinox? At Tempe's latitude the Sun rises at an angle, arcing southward as it climbs above the horizon. Because the distant mountains hide the true horizon, the Sun shifts slightly southward by the time it clears the mountain tops. Waiting 24 hours allowed the Sun to rise just north of east and arc back to an exactly eastern alignment for the photo. Today is another Equinox + 1 day, with the Sun crossing the celestial equator yesterday at about 17:32 Universal Time. Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) NASA Official: Phillip Newman Specific rights apply. NASA Web Privacy Policy and Important Notices A service of: ASD at NASA / GSFC & Michigan Tech. U.
grobi
@grobi@defcon.social  ·  activity timestamp 2 days ago
2025 December 22 The sun is setting across a field in a clear sky. In the field are the famous stones of Stonehenge. The Sun peaks out from the center of the stone array. Sunset Solstice over Stonehenge * Image Credit & Copyright: English Heritage, Josh Dury Explanation: Yesterday the Sun reached its southernmost point in planet Earth's sky. Called a solstice, many cultures mark yesterday's date as a change of seasons -- from autumn to winter in Earth's Northern Hemisphere and from spring to summer in Earth's Southern Hemisphere. The featured image was taken just before the longest night of the 2025 northern year at Stonehenge in United Kingdom. There, through stones precisely placed 4,500 years ago, a 4.5 billion year old large glowing orb is seen setting. Even given the precession of the Earth's rotational axis over the millennia, the Sun continues to set over Stonehenge in an astronomically significant way. Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) NASA Official: Amber Straughn Specific rights apply. NASA Web Privacy, Accessibility, Notices; A service of: ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U.
2025 December 22 The sun is setting across a field in a clear sky. In the field are the famous stones of Stonehenge. The Sun peaks out from the center of the stone array. Sunset Solstice over Stonehenge * Image Credit & Copyright: English Heritage, Josh Dury Explanation: Yesterday the Sun reached its southernmost point in planet Earth's sky. Called a solstice, many cultures mark yesterday's date as a change of seasons -- from autumn to winter in Earth's Northern Hemisphere and from spring to summer in Earth's Southern Hemisphere. The featured image was taken just before the longest night of the 2025 northern year at Stonehenge in United Kingdom. There, through stones precisely placed 4,500 years ago, a 4.5 billion year old large glowing orb is seen setting. Even given the precession of the Earth's rotational axis over the millennia, the Sun continues to set over Stonehenge in an astronomically significant way. Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) NASA Official: Amber Straughn Specific rights apply. NASA Web Privacy, Accessibility, Notices; A service of: ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U.
2025 December 22 The sun is setting across a field in a clear sky. In the field are the famous stones of Stonehenge. The Sun peaks out from the center of the stone array. Sunset Solstice over Stonehenge * Image Credit & Copyright: English Heritage, Josh Dury Explanation: Yesterday the Sun reached its southernmost point in planet Earth's sky. Called a solstice, many cultures mark yesterday's date as a change of seasons -- from autumn to winter in Earth's Northern Hemisphere and from spring to summer in Earth's Southern Hemisphere. The featured image was taken just before the longest night of the 2025 northern year at Stonehenge in United Kingdom. There, through stones precisely placed 4,500 years ago, a 4.5 billion year old large glowing orb is seen setting. Even given the precession of the Earth's rotational axis over the millennia, the Sun continues to set over Stonehenge in an astronomically significant way. Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) NASA Official: Amber Straughn Specific rights apply. NASA Web Privacy, Accessibility, Notices; A service of: ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U.
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