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WaterMasterAdministrator
Moat Keeper
*****

Reged: 02/17/10

Loc: Southeast Idaho, USA
Re: Share your random "rules of thumb" here! new [Re: sonny.barile]
      #5651293 - 01/29/13 10:22 PM

Quote:

... a pair of little stinky eyes ...




Are you sure it was his eyes that were stinky?

Edited by WaterMaster (01/29/13 10:23 PM)


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coutleef
Post Laureate
*****

Reged: 02/21/08

Loc: Saint-Donat, Québec, Canada
Re: Share your random "rules of thumb" here! new [Re: Skip]
      #5651838 - 01/30/13 09:10 AM

Quote:

Quote:

when this means you have to dress as if it was -60F, just stay indoors to plan your next session




Hi François ,

You tough Canadians crack me up! I think I would have stated that as "...when this means you have to dress as if it was 20F [positive 20] just stay indoors to plan your next session ..."

But I to your toughness.




not that tough in reality, the last two winters were very mild as it rarely went below -15F

the first time i used my 8se at my dark site, the temperature was at -42F. i managed to set ip, align the RDF and look at Capella ( i thougth it was mars!!) and went back in!! it took me 30 minutes just to align the finder with bare hands: it took me two months before i took the scope out again, but the month of march was glorious that year. And that was the winter i discovered cloudynigths.

this year is horrible at my dark site: we swing from -35 at nigth one week to 50F the next one. that kind of weather brings a lot of clouds and unsteady air. i just want a real winter, colder but more predictable


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cpl43uk
sage


Reged: 02/09/08

Loc: Bristol, UK
Re: Share your random "rules of thumb" here! new [Re: coutleef]
      #5664622 - 02/06/13 02:58 AM

Sorry, may not be a 'rule of thumb' but i find it helps appreciate distance.... If the earth to sun distance was an inch, then an object a light year away would be a mile. I use this at public outreach sessions to help make sense of the numbers we spout about 'faint fuzzies'....

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Arthur Dent
Galactic Hitch-Hiker
*****

Reged: 10/23/08

Loc: South Yorkshire, UK
Re: Share your random "rules of thumb" here! new [Re: cpl43uk]
      #5664657 - 02/06/13 05:06 AM

Hi cpl,

Yep, that's a good one. A discussion about this and the distances to some famous objects using this scale can be found at: http://earthsky.org/astronomy-essentials/how-far-is-a-light-year

On this scale, the Milky Way galaxy comes out to be 100,000 miles across and we're 27,000 miles from the centre (just slightly more than once around the Earth), and M31 - The Great Galaxy in Andromeda is a staggering 2,300,000 miles away (or 10x further than the Moon).

'Course the REALLY staggering thing is that in real life, they are actually 63,000x further away than this!

Space sure is big!

Art


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Terrance
professor emeritus


Reged: 08/11/04

Loc: Near Portland Or.
Re: Share your random "rules of thumb" here! new [Re: sonny.barile]
      #5674110 - 02/11/13 01:54 PM

Whatever can be tripped over in the dark, will, given enough time, actually be tripped over in the dark.

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Skip
Starlifter Driver
*****

Reged: 01/23/08

Loc: Fort Worth, Texas, USA
Re: Share your random "rules of thumb" here! new [Re: Terrance]
      #5675833 - 02/12/13 01:13 PM

Quote:

Whatever can be tripped over in the dark, will, given enough time, actually be tripped over in the dark.




I believe that is the 302nd corrolary to Murphy's Law. Or is it the 303rd?


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Peter9
Post Laureate
*****

Reged: 10/30/08

Loc: Yorkshire - Born & Bred
Re: Share your random "rules of thumb" here! new [Re: Skip]
      #5675870 - 02/12/13 01:32 PM

I have verbally tripped up so many times that I no longer open my mouth and put my foot in it. I now open my mouth to change feet.

Regards. Peter


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Bob Myler
Pooh-Bah
*****

Reged: 05/18/06

Loc: St Louis, MO
Re: Share your random "rules of thumb" here! new [Re: Peter9]
      #5676386 - 02/12/13 06:15 PM

On average - there are as many Earth diameters separating us from the Moon - as there are Astronomical Units separating the Sun from its farthest "official" planet.

Now stick that in your pipe and smoke it!


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WarmWeatherGuy
Carpal Tunnel
*****

Reged: 08/27/11

Loc: Orlando, FL 28° N, 81° W
Re: Share your random "rules of thumb" here! [Re: Bob Myler]
      #5676521 - 02/12/13 08:12 PM

Here is my rule of thumb for central Florida:

Whatever ClearDarkSky predicts for the humidity the actual humidity will be 100%.


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