Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
3,892 replies · 244K views
Physics news on Phys.org
Keith_McClary
- 752
- 1,507
Sunbeams are (essentially) parallel lines in 3D space. They appear to diverge from the Sun due to parallax. Near dawn or dusk they can extend across the sky and appear to converge at the anti-solar point. (Think train tracks.)BillTre said:Not sure about the hazy stripes of white light illumination radiating to the center of the rainbow arc
Anticrepuscular rays appear opposite of a sunrise on the Gulfcoast of Mississippi. Note the anticrepuscular rays are perpendicular to the rainbow. Photo:Chatnuck24
Point Conception
Gold Member
- 1,170
- 1,937
To conclude the (I miss) New York State of Mind series: The Puerto Rican girls were charging $3/photo so had to be unnoticed. Midtown, Canal st Chinatown. Lower East Side near Tompkins Square
Last edited:
- 7,815
- 4,144
We've had a special visitor for the past few days:
This has been identified as a female summer tanager, a bird that should not be anywhere near us. In fact, if confirmed, this will be the first recorded sighting (in our region) since bird surveys began in 1900. A group of local experts is scheduled to come by tomorrow (12/19) to observe and confirm (while socially distant, etc.)... some excitement!
This has been identified as a female summer tanager, a bird that should not be anywhere near us. In fact, if confirmed, this will be the first recorded sighting (in our region) since bird surveys began in 1900. A group of local experts is scheduled to come by tomorrow (12/19) to observe and confirm (while socially distant, etc.)... some excitement!
Mondayman
- 328
- 503
Ny new number one guitar, an Epiphone 1959 LP Standard. Plays and sounds amazing, for $1150 you have a quality guitar. I personally think Gibson is overpriced. They are fantastic instruments for sure, but considering you're paying atleast $3000 Canadian for a standard guitar, Epiphone is a really bang for your buck choice. That being said, I would spend an eons worth of wages to get my hands on a Jimmy Page LP..
Attachments
Point Conception
Gold Member
- 1,170
- 1,937
No prizes for guessing name of tree that starts with U
rsk
- 289
- 260
The Physics of Snowmen thread reminded me of this photo, taken a few years ago now. I love the pattern produced.
Science Advisor
Gold Member
- 4,458
- 3,265
waternohitter said:We'd like to see the photo album of your father.
A little history:dlgoff said:My father was in the US Marine Corps stationed in the Philippines during WW2.
Dad enlisted in the Marine Corps at the beginning of his high school's senior year when he was engaged to my Mom who was in her high school's Junior year. At the beginning of Mom's Senior year she was recruited by J Edgar Hoover, Director of the Federal Bureau of Investigation, and went to Washington DC. While there she acquired these photos of president Roosevelt's funeral procession past the White House:
Leo Liu
- 353
- 156
A dumb Canada goose
Victoria Park, London, Ontario, CA
Point Conception
Gold Member
- 1,170
- 1,937
Orange Reindeer, someone had to do it. Amari Pattaya
- 3,773
- 1,991
The earlier photo of the Volcano made me think of these:
Mt Saint Helens, from Longview, WA. This is one of the later eruptions. The gray on the roofs is ash from an earlier one( The second eruption. The first main eruption occurred with Westerly prevailing winds, which carried the ash East, The next one during Easterly winds, carrying it West.
Longview after the 2nd eruption. At the time, I lived just a mile or so beyond the hills in the background.
Mt Saint Helens, from Longview, WA. This is one of the later eruptions. The gray on the roofs is ash from an earlier one( The second eruption. The first main eruption occurred with Westerly prevailing winds, which carried the ash East, The next one during Easterly winds, carrying it West.
Longview after the 2nd eruption. At the time, I lived just a mile or so beyond the hills in the background.
DennisN
Gold Member
- 2,194
- 10,295
Two long exposure panoramas I took this evening:
(ISO 50, Exposure: 15 sec)
Pond and park:
(larger versions are here)
A garden with an old pavilion, built in 1914 for the Baltic Exhibition:
(larger versions are here)
(ISO 50, Exposure: 15 sec)
Pond and park:
(larger versions are here)
A garden with an old pavilion, built in 1914 for the Baltic Exhibition:
(larger versions are here)
Point Conception
Gold Member
- 1,170
- 1,937
Jomtien-beach
Point Conception
Gold Member
- 1,170
- 1,937
A few more from Gulf of Thailand
Science Advisor
Gold Member
- 4,458
- 3,265
In order to honor my father, I put up this flag pole on my storm shelter with a US Marine Corps flag on it.dlgoff said:A little history:
Dad enlisted in the Marine Corps at the beginning of his high school's senior year when he was engaged to my Mom who was in her high school's Junior year. At the beginning of Mom's Senior year she was recruited by J Edgar Hoover, Director of the Federal Bureau of Investigation, and went to Washington DC. While there she acquired these photos of president Roosevelt's funeral procession past the White House:
View attachment 275438
View attachment 275439
View attachment 275440
Last edited:
Science Advisor
- 1,369
- 1,147
What I saw today when came to my car after three days parking (Moscow)
DennisN
Gold Member
- 2,194
- 10,295
Janus said:Night sky through trees near Mt. Adams, WA.
I tried it yesterday when I was out photographing the night sky.DennisN said:What a cool photo, and what a great photo idea! I have to try to do that sometime!
It became a bit "too much trees" and "too little sky", but anyway here it is:
(it was taken in a park in the city with quite a bit of light pollution)
(LG G4 phone with a wide angle lens and light pollution filter attached, ISO 400, 10 seconds exposure, and a bit of postprocessing in Photoshop)
And astrometry.net managed to identify it
Last edited:
- 7,815
- 4,144
Some water crystals that fell from the sky last night:
Point Conception
Gold Member
- 1,170
- 1,937
Point Conception
Gold Member
- 1,170
- 1,937
Science Advisor
- 3,638
- 1,014
morrobay said:
Fascinating. At first I took this to be tyre tracks at the sea's edge. Then you realize this is produced by the wash of the sea. No doubt there is some theory for the stepped structure.
Perpendicular to the steps there also looks to be some kind of periodic structure in the sand suspended in the water.
Point Conception
Gold Member
- 1,170
- 1,937
Another angle
Last edited:
DennisN
Gold Member
- 2,194
- 10,295
I've got a new camera, my first system camera.
It takes better photos than my smartphone. MUCH better.
Some of my first photos with the camera:
My cat (3 days ago)
A clock tower in the evening (tonight)
Quite sharp, even though it was a very low light situation.
My smartphone would not have been able to take such a sharp photo in that situation,
no matter how I would try to take it.
Regretfully some image compression can be seen here in the sky around the tower, since it is a JPG.
The original uncompressed image (ARW) does not have those artifacts.
It takes better photos than my smartphone. MUCH better.
Some of my first photos with the camera:
My cat (3 days ago)
A clock tower in the evening (tonight)
Quite sharp, even though it was a very low light situation.
My smartphone would not have been able to take such a sharp photo in that situation,
no matter how I would try to take it.
Regretfully some image compression can be seen here in the sky around the tower, since it is a JPG.
The original uncompressed image (ARW) does not have those artifacts.
Last edited:
Point Conception
Gold Member
- 1,170
- 1,937
- 19,385
- 15,622
No, it doesn't look familiar. The high density, bright color, and distinctive grain make it something I would likely remember if I had seen it before. Most likely it is a common Asian wood that never gets into America. That happens a fair amount with woods of the world.
How wide is the piece on the right.?
How wide is the piece on the right.?
Point Conception
Gold Member
- 1,170
- 1,937
16cm wide x 80cm x 3cm. At 4kg (plus varnish one side)
DennisN
Gold Member
- 2,194
- 10,295
It was a sunny day today:
- 7,815
- 4,144
22 degree lunar ice halo this evening:
A great atmospheric optics site:
https://www.atoptics.co.uk/halosim.htm
A great atmospheric optics site:
https://www.atoptics.co.uk/halosim.htm
DennisN
Gold Member
- 2,194
- 10,295
Beautiful!Andy Resnick said:22 degree lunar ice halo this evening
Similar threads
Graduate Diffraction from a set of concentric rings with random phase
- Gezstarski
- · Replies 2 ·
- Optics
- Replies
- 2
Correct statement about random process of radioactive decay
- songoku
- · Replies 12 ·
- Introductory Physics Homework Help
- Replies
- 12
Sinusoidal sequences with random phases
- ashah99
- · Replies 1 ·
- Calculus and Beyond Homework Help
- Replies
- 1
Art Please rate my photos on a scale of 1-5
- BadgerBadger92
- · Replies 73 ·
- Art, History, and Linguistics
- Replies
- 73
Very cool factory production line photos
- berkeman
- · Replies 7 ·
- Mechanical Engineering
- Replies
- 7
Undergrad Do you have an example of a truly random phenomenon?
- The_Baron
- · Replies 122 ·
- Other Physics Topics
- Replies
- 122
Undergrad How does spontaneous emission start laser oscillation if photons have random phases?
- kelly0303
- · Replies 19 ·
- Atomic and Condensed Matter
- Replies
- 19
Looking for a reliable inkjet All-In-One printer for photos and docs
- yungman
- · Replies 27 ·
- Computing and Technology
- Replies
- 27
Undergrad Random variable vs Random Process
- fog37
- · Replies 2 ·
- Set Theory, Logic, Probability, Statistics
- Replies
- 2
Stargazing Question about my photos of a Full Moon -- What is this point of light?
- Graham 1956
- · Replies 5 ·
- Astronomy, Astrophysics, Cosmology
- Replies
- 5