Search found 7 matches

by hypermetabolic
Tue Apr 23, 2024 6:03 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Contrail Shadow X (2024 Apr 23)
Replies: 20
Views: 568

Re: APOD: Contrail Shadow X (2024 Apr 23)

If it were illuminated from below, we would see the contrail in front of the cloud deck. We don't.
by hypermetabolic
Mon Jan 15, 2024 4:59 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Dragon Aurora over Iceland (2024 Jan 14)
Replies: 8
Views: 5668

Re: APOD: Dragon Aurora over Iceland (2024 Jan 14)

Walt Kelley wrote:
Oh, roar a roar for Nora, Nora Alice in the night, For she has seen Aurora Borealis burning bright. A furore for our Nora! And applaud Aurora seen! Where, throughout the Summer, has Our Borealis been?
by hypermetabolic
Wed Oct 25, 2023 6:46 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Gone in 60 Seconds: A Green Flash Sunset (2023 Oct 25)
Replies: 15
Views: 20162

Re: APOD: Gone in 60 Seconds: A Green Flash Sunset (2023 Oct 25)

During my one year at Thule Greenland, 77 degrees north, during the first sunsets after summer the sun grazed the horizon horizontally before rising again. I could control the degree of sunset by walking up and down a north facing hillside, seeing all the stages pictured here, including violet! Than...
by hypermetabolic
Thu Apr 27, 2023 11:50 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Waterspout in Florida (2023 Apr 23)
Replies: 10
Views: 2488

Re: APOD: A Waterspout in Florida (2023 Apr 23)

A true waterspout is the analogue of a dust devil, but over warm water rather than land. These were often seen over Lake Erie in late summer during clear days. Pictured here is a tornado over water.
by hypermetabolic
Wed Mar 29, 2023 1:22 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Multiple Green Flash Sunset (2023 Mar 28)
Replies: 7
Views: 1936

Re: APOD: A Multiple Green Flash Sunset (2023 Mar 28)

During my year in Thule, Greenland, only 10 degrees from the North Pole, at the end of the 24 hour sunlight season the setting sun would graze the horizon before rising again. I could change the sun's apparent altitude by walking up and down a north-facing hill. The polar air was very clear, so I co...
by hypermetabolic
Tue Mar 14, 2023 1:55 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Rainbow Tree (2023 Mar 13)
Replies: 21
Views: 3328

Re: APOD: Rainbow Tree (2023 Mar 13)

And what is that fainter rainbow just inside the main one, most visible near the horizon?
by hypermetabolic
Wed Jul 13, 2022 2:40 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Noctilucent Clouds over Paris (2022 Jul 12)
Replies: 6
Views: 1876

Re: APOD: Noctilucent Clouds over Paris (2022 Jul 12)

When I was working in Greenland 13 degrees north of the Arctic Circle, one noon in midwinter with an overcast sky a pure red glow lit up the landscape. It lasted about 15 minutes and vanished quickly. I assume the sunlight was trapped between the snowy earth and the cloud layer and travelled over 13...