Search found 5375 matches

by David Frydman
Sun Mar 28, 2021 5:05 pm
Forum: General chat
Topic: What is your favourite silly Unit in astronomy
Replies: 19
Views: 524

Re: What is your favourite silly Unit in astronomy

Thanks John for the correction. I can't read my own writing. The main problem is that my reading glasses are so scratched I can't see through them properly. This is because it is 3 years since I had an eye test because of Covid. I don't want to get up close to an opthalmologist. I think I'll take an...
by David Frydman
Sat Mar 27, 2021 5:53 pm
Forum: General chat
Topic: What is your favourite silly Unit in astronomy
Replies: 19
Views: 524

Re: What is your favourite silly Unit in astronomy

Welders glass shades are the 7th root of 1000 or 2.6837.

square root of 7=2.6458.

e=2.7182.

magnitude steps 2.512 (2.5119).

The welders shade steps are the wierdest when I tried to find out what they were, as I thought the other three might be correct.

Regards,
David
by David Frydman
Wed Mar 24, 2021 6:09 pm
Forum: General chat
Topic: Basil Brown
Replies: 2
Views: 120

Basil Brown

I watched the film The Dig yesterday. I enjoyed it, with good actors. Basil Brown was an amateur astronomer also and belonged to the BAA. He wrote a book on star atlases, which was reprinted in 1968. He excavated the Sutton Hoo treasure, but was only recently credited for his work, which was hijacke...
by David Frydman
Thu Mar 11, 2021 4:18 pm
Forum: General chat
Topic: Silly Quiz
Replies: 10
Views: 390

Re: Silly Quiz

Looking at a real time aurora watch camera in Sodankyla last night I was surprised to see Orion.

Probably because of the high latitude.

Eventually, I suppose many stars will be in the 'wrong' constellation.

Regards,
David
by David Frydman
Sat Mar 06, 2021 3:25 pm
Forum: Observing
Topic: Newbie
Replies: 5
Views: 274

Re: Newbie

Hi Ash and welcome. On YouTube I looked up aurora cameras and there are many live view. There have been several bright displays the last few evenings from Utsjoki, Nuorgam and Rovaniemi. They show stars as faint as a dark sky view. There are videos of planets etc. also. Some are very good. I haven't...
by David Frydman
Thu Mar 04, 2021 10:22 pm
Forum: Observing
Topic: March a good month for aurorae watching
Replies: 10
Views: 392

Re: March a good month for aurorae watching

There was a very bright display from the Utsjoki camera this evening, I think in live view and real time. Latitude 70 north. I went there once for a coffee on a 15 day $90 Finnnair unlimited flights special deal. If one looks up aurora cameras on Youtube there are many and some have clear skies. The...
by David Frydman
Thu Mar 04, 2021 3:49 pm
Forum: Observing
Topic: March a good month for aurorae watching
Replies: 10
Views: 392

Re: March a good month for aurorae watching

There was an extensive fairly quiet mainly green aurora in Live view from Sodankyla last night 2021 March 3/4. On YouTube. I visited Sodankyla observatory in the 1960s and talked with the director who spoke archaic English that he learned from old scientific books. There was no visual telescope but ...
by David Frydman
Wed Mar 03, 2021 5:48 pm
Forum: Telescopes and instruments
Topic: Brexit duty on astro-imports ..
Replies: 14
Views: 1401

Re: Brexit duty on astro-imports ..

Trying to find details from a New York dealer, they say that I am not a human.

They may well be right.

I didn't try to prove that I am a human.

Perhaps a philosophical question.

Regards,
David
by David Frydman
Fri Jan 29, 2021 11:09 pm
Forum: Visual Satellite Observing
Topic: The UFO files
Replies: 8
Views: 629

Re: The UFO files

Ariel gives the UFOs beautifully laundered freshness and fine smelling aliens.

Regards,
David
by David Frydman
Fri Jan 29, 2021 6:56 pm
Forum: Observing
Topic: Looking for VESTA
Replies: 32
Views: 1206

Re: Looking for VESTA

Their eyes. The normal young Aboriginal Australian acuity range is 6/3 to 6/2 with a best of 6/1.4 using both eyes as measured by an Australian professor. However, nowadays when older they have many eye problems caused by poor conditions, poor health, poor health facilities, lifestyle etc. It was on...
by David Frydman
Fri Jan 29, 2021 6:38 pm
Forum: Telescopes and instruments
Topic: Which binoculars?
Replies: 9
Views: 377

Re: Which binoculars?

My pupils still reach over 5.5mm and I got my very old person Covid jab a few days ago. So one should measure ones pupils. One can try different binoculars depending on local light pollution etc. Exit pupil is only part of the story. I use 12x56, 12x50, 12x45, 10x50, 8.5x44 (I get full use of the 5....
by David Frydman
Fri Jan 29, 2021 5:30 pm
Forum: General chat
Topic: Making a Monocular from a Binocular
Replies: 9
Views: 459

Re: Making a Monocular from a Binocular

I have two German army monoculars that came from a damaged binocular. Hensoldt Wetzlar 8x30s. I prefer the right sided one, but it has the reticule, which is a nuisance at night as the lines can obscure stars etc. IF binoculars have dioptres on both sides. The Soviet 8x30 binoculars have eyepieces t...
by David Frydman
Fri Jan 29, 2021 5:06 pm
Forum: Observing
Topic: Looking for VESTA
Replies: 32
Views: 1206

Re: Looking for VESTA

I have seen Uranus numerous times with unaided eyes. It was rather easy. I have asked for reports of an unaided eyes sighting of Neptune, but no success yet. I think at the best high elevation sites it could be seen at magnitude 7.8 by someone with exceptional sight. But it has an unusual spectrum. ...
by David Frydman
Sat Jan 02, 2021 4:29 pm
Forum: Observing
Topic: Sun Dogs & Spectral Arc
Replies: 10
Views: 294

Re: Sun Dogs & Spectral Arc

I saw an all sky halo display in Finland about 1980. It was the most beautiful sight I have ever seen observing the sky. There were numerous and some very rare forms. Complete horizontal arc. Forms opposite the Sun. There were two suns, one false. There was probably a third hidden behind a building ...
by David Frydman
Sat Jan 02, 2021 4:14 pm
Forum: Observing
Topic: Attempt at HU Tauri Occultation 27 Dec 2020
Replies: 11
Views: 313

Re: Attempt at HU Tauri Occultation 27 Dec 2020

My old 123mm f/5 refractor goes from 16x with an old Kodak 38mm Eyepiece. 4.7 degree field. The drawtube is 3 inches diameter. The telescope has no finder as it doesn't need one. There are modern 3 inch eyepieces, maybe also bigger. The Yerkes refractor drawtube may be 5 inch diameter. The 123mm ref...