usvi-on-line
Green Flash
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TraumaQueen
- Posts: 162
- Joined: Tue Jan 31, 2012 3:28 pm
- Location: Mississippi
Green Flash
Where is the best place to see this IF it happens? Does it last long enough to photograph?
Have any of you seen it? Any pictures you'd like to share?
Have any of you seen it? Any pictures you'd like to share?
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snorkelqueen
- Posts: 432
- Joined: Tue May 29, 2007 12:33 pm
- Location: california
I've never seen in SJ because it happens as the sun hits the horizon at the water and I've never been in a place to see that actually happen. I've seen it many times in Hawaii and a few times here in California. And NO my experience is that it is a FLASH and happens in a nano-second so no photo opps.
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TraumaQueen
- Posts: 162
- Joined: Tue Jan 31, 2012 3:28 pm
- Location: Mississippi
That's awesome you've actually seen it! Thanks for letting me know it happens too fast. I'll just sit back and enjoy it if I can find a spot instead of trying to photograph it!snorkelqueen wrote:I've never seen in SJ because it happens as the sun hits the horizon at the water and I've never been in a place to see that actually happen. I've seen it many times in Hawaii and a few times here in California. And NO my experience is that it is a FLASH and happens in a nano-second so no photo opps.
IMO, you'd have a difficult time seeing one from STJ. Besides STT & the out-lying cays generally blocking a view of the horizon, the low clouds particular to that region would foul up a perfect view of the sunset. (Although those same clouds contribute to creating some great colors at sunset!)
I've seen a couple of them in the San Diego area. Often low humidity there, so perfect views of the horizon at sunset.
I'm not saying that its impossible to see it from STJ; just low odds.
I've seen a couple of them in the San Diego area. Often low humidity there, so perfect views of the horizon at sunset.
I'm not saying that its impossible to see it from STJ; just low odds.
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TraumaQueen
- Posts: 162
- Joined: Tue Jan 31, 2012 3:28 pm
- Location: Mississippi
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Teddy Salad
- Posts: 205
- Joined: Thu Mar 08, 2007 7:05 am
- Location: Colorado
The Southern Cross is a star constellation that is only visible from about the Tropic of Cancer southward. The only US states it is visible from are Hawaii and the Florida keys.
The best viewing times of the year from the northern tropics is May and June. It is visible at other times of the year, but you have to either stay up late or get up very early. It is not visible in the fall because it is above the horizon only in the daytime.
The optimal viewing time for mid-May in St. John is about 9:30 PM. That is when it is highest in the sky. It will be due South then. It looks like a kite to me. To see it, you will need an unobstructed view to the South and clear skies. The topmost star is about 15 degrees above the horizon at 9:30 PM. How much is 15 degrees? Well, if you make a fist and extend your arm in front of you with your thumb on top, place the bottom of your fist on the horizon. The top of your fist will be at about 10 degrees. So 15 degrees is about a "fist and a half".
Later in the evening, the Cross will move westward, drop toward the horizon, and tilt to the right.
I always try to see it when I'm in the tropics. I've never seen the green flash. My wife says if we have a Tanqueray bottle on hand we could see it then.
The best viewing times of the year from the northern tropics is May and June. It is visible at other times of the year, but you have to either stay up late or get up very early. It is not visible in the fall because it is above the horizon only in the daytime.
The optimal viewing time for mid-May in St. John is about 9:30 PM. That is when it is highest in the sky. It will be due South then. It looks like a kite to me. To see it, you will need an unobstructed view to the South and clear skies. The topmost star is about 15 degrees above the horizon at 9:30 PM. How much is 15 degrees? Well, if you make a fist and extend your arm in front of you with your thumb on top, place the bottom of your fist on the horizon. The top of your fist will be at about 10 degrees. So 15 degrees is about a "fist and a half".
Later in the evening, the Cross will move westward, drop toward the horizon, and tilt to the right.
I always try to see it when I'm in the tropics. I've never seen the green flash. My wife says if we have a Tanqueray bottle on hand we could see it then.
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TraumaQueen
- Posts: 162
- Joined: Tue Jan 31, 2012 3:28 pm
- Location: Mississippi
Wow! Thank you for the info! We'll be sure to look for it!Teddy Salad wrote:The Southern Cross is a star constellation that is only visible from about the Tropic of Cancer southward. The only US states it is visible from are Hawaii and the Florida keys.
The best viewing times of the year from the northern tropics is May and June. It is visible at other times of the year, but you have to either stay up late or get up very early. It is not visible in the fall because it is above the horizon only in the daytime.
The optimal viewing time for mid-May in St. John is about 9:30 PM. That is when it is highest in the sky. It will be due South then. It looks like a kite to me. To see it, you will need an unobstructed view to the South and clear skies. The topmost star is about 15 degrees above the horizon at 9:30 PM. How much is 15 degrees? Well, if you make a fist and extend your arm in front of you with your thumb on top, place the bottom of your fist on the horizon. The top of your fist will be at about 10 degrees. So 15 degrees is about a "fist and a half".
Later in the evening, the Cross will move westward, drop toward the horizon, and tilt to the right.
I always try to see it when I'm in the tropics. I've never seen the green flash. My wife says if we have a Tanqueray bottle on hand we could see it then.
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TraumaQueen
- Posts: 162
- Joined: Tue Jan 31, 2012 3:28 pm
- Location: Mississippi
This is a link to a SkyChart for the month of May in the Caribbean region. The Southern Cross ... the constellation "Crux" ... is due south in the diagram.
http://skymaps.com/skymaps/tesme1205.pdf
Since this chart is for theoretical observation at the Equator, Crux will be lower in the horizon when viewed at latitude 18. Still, its quite visible with good skies. Great viewing location is the passenger ferry to/from Red Hook in the evening.
http://skymaps.com/skymaps/tesme1205.pdf
Since this chart is for theoretical observation at the Equator, Crux will be lower in the horizon when viewed at latitude 18. Still, its quite visible with good skies. Great viewing location is the passenger ferry to/from Red Hook in the evening.