Search found 902 matches

by Eclipse
Wed May 21, 2014 10:19 pm
Forum: Telescopes and instruments
Topic: Laser pointers
Replies: 15
Views: 7104

Re: Laser pointers

If a laser is mounted as a piece of scientific equipment - ie not hand held - then different rules apply. At a certain establishment in Berkshire they use lasers to initiate nuclear fusion - they are a bit more powerful than 1 mW!! Mounted on your telescope may appear to be covered by this proviso. ...
by Eclipse
Wed May 21, 2014 10:03 pm
Forum: Telescopes and instruments
Topic: DMK21 Mono Imaging Camera & PST
Replies: 2
Views: 2052

Re: DMK21 Mono Imaging Camera & PST

I have a PST which I double-stack - I have been wanting to get a DMK21, your results have inspired me enormously - thanks!!
by Eclipse
Wed May 21, 2014 9:58 pm
Forum: Light pollution
Topic: DIY Turn off your local street light ?
Replies: 14
Views: 13169

Re: DIY Turn off your local street light ?

Us solar observers just laugh at light pollution!!
by Eclipse
Sun May 05, 2013 9:26 pm
Forum: General chat
Topic: Climate Change - Global Warming CC-GW PART 1
Replies: 46
Views: 7575

Re: Climate Change - Global Warming CC-GW PART 1

brian livesey wrote: I'm no expert, but is water vapour really a "gas"?
Yes water vapour is quite gaseous.
by Eclipse
Sun Apr 14, 2013 11:22 am
Forum: General chat
Topic: Climate Change - Global Warming CC-GW PART 1
Replies: 46
Views: 7575

Re: Climate Change - Global Warming CC-GW PART 1

Whenever I meet a global warming panicker, I always ask what is the most important greenhouse gas?! None of them have got it right yet.
by Eclipse
Thu Mar 28, 2013 2:48 pm
Forum: General chat
Topic: Climate Change - Global Warming CC-GW PART 1
Replies: 46
Views: 7575

Re: Climate Change - Global Warming CC-GW PART 1

As no one here seems to have any idea - the MOST IMPORTANT greenhouse gas is WATER VAPOUR. Because of the water vapour in the atmosphere, the Earth´s mean temperature is maintained PRESENTLY at +15C. Take out the water vapour and it drops to -15C - which has happened in the past - when the entire pl...
by Eclipse
Thu Mar 28, 2013 2:40 pm
Forum: General chat
Topic: What future for casual astronomy?
Replies: 33
Views: 7901

Re: What future for casual astronomy?

peteuplink wrote: Took me ages to convert from VHS to DVD :mrgreen:
You do realise that Betamax is technically the best system!
by Eclipse
Tue Mar 26, 2013 6:13 pm
Forum: General chat
Topic: Climate Change - Global Warming CC-GW PART 1
Replies: 46
Views: 7575

Re: Climate Change - Global Warming CC-GW PART 1

Ever since the earth formed its climate has ALWAYS been changing. The question is what is causing this change - is it anything at all to do with CO2 levels or do changes in CO2 levels actually follow changes in climate rather than cause them, as some climatologists believe to be the case. And what i...
by Eclipse
Sun Mar 17, 2013 5:47 pm
Forum: General chat
Topic: What future for casual astronomy?
Replies: 33
Views: 7901

Re: What future for casual astronomy?

peteuplink wrote:Took me ages to convert from VHS to DVD :mrgreen:
Betamax FOR EVER !!!!!
by Eclipse
Sun Mar 03, 2013 7:47 pm
Forum: Absolute beginners
Topic: Finding the Pole Star (degrees of elevation)
Replies: 18
Views: 11745

Re:

Am I right in saying that 1 degree is approximately 70 miles? Depends what sort of miles you are talking about. If you start thinking about Nautical Miles it gets a lot easier (again approximately as there are slight variations) but 1 deg =(approx.) 60 Nautical miles Ian Isn´t 1 degree of latitude ...
by Eclipse
Sun Mar 03, 2013 7:36 pm
Forum: General chat
Topic: Sir Patrick Moore
Replies: 53
Views: 13858

Re: Sir Patrick Moore

I find the vitriol being thrown after the death of a good man all rather sad.
by Eclipse
Sun Mar 03, 2013 7:16 pm
Forum: General chat
Topic: GOTO in Theory and Practice
Replies: 12
Views: 2803

Re: GOTO in Theory and Practice

David Frydman wrote: make the Earth flat,

Isn´t it ??
by Eclipse
Mon Sep 24, 2012 12:40 am
Forum: General chat
Topic: Flat lenses will revolutionise optics?
Replies: 8
Views: 2254

Re: Flat lenses will revolutionise optics?

David Frydman wrote:Also at Imperial College theoretically it is possible to bend light so that an object disappears.
Didn´t ´Q´ do that with a car in one of the Bond movies?
by Eclipse
Mon Sep 17, 2012 11:06 pm
Forum: Observing
Topic: Albireo
Replies: 2
Views: 833

Albireo

I had my first view of Albireo (beta Cygni) tonight. Wow it knocked my socks off, beautiful bright, wide double, the two stars of distinctly different colours (orange and blue). Currently very close to the zenith at civilised observing times. Recommended.
by Eclipse
Thu Aug 30, 2012 1:44 pm
Forum: Telescopes and instruments
Topic: What size Threads ?
Replies: 1
Views: 1645

Re: What size Threads ?

This sort of thing is always a problem. Manufacturers can and do use a mix of standards. I wanted some additional screws for my Stellarvue clamshell - an email to Vic Maris got me the required info - some obscure imperial size thread. A quick google found me a supplier in the UK - only pennies each....