Sunset question

[carlos_dfc]

Even with naked-eye you can see a tint of colour to some stars.
Antares in Scorpio has a definite reddish hue, so do Aldeberan in Taurus, Betelgeuse in Orion - and a fair few others. Sirius and Vega are striking brilliant white.

You really see the different colours when looking at double stars of differing hues - being close to each other, the contrast can sometimes really bring out the colours.
An easy one is Albireo - the bottom star of the 'cross' shape of Cygnus, the swan.
At this time of year it is lying on it's side - high to the East by the time it gets dark
(check out the map below)
Even in modest binoculars (10x50 will do) it is possible to see the two seperate stars (bigger binocs, or a small telescope are even better) - the brighter one is a brilliant yellow - and the other is a definite touquoise colour.

Colour contrasting double-stars were a particular favourite of well-to-do Victorian 'Gentleman' astronomers.

[SparklySarah]

Originally Posted by carlos_dfc

Even with naked-eye you can see a tint of colour to some stars.
Antares in Scorpio has a definite reddish hue, so do Aldeberan in Taurus, Betelgeuse in Orion - and a fair few others. Sirius and Vega are striking brilliant white.

Red shift! Yay! I learned something in science! If a star is coming towards us, it had a blue tinge, and if it going away, it has a blue tinge. Has the same effect on sounds (listen to a siren as it goes past, theres a slight change in the pitch)........ just without the colour!!

[jordanno]

wow thta link shows just how small our solar system is imagine pluto against antares
first you got jupiter making earth look tiny the the sun making jupiter tiny then artucus makin the sun tiny then antares makin artucus tiny imagine earth compared to antares
or evn better pluto compared to antares

[nightshade]

The occasional Sahara dust storm can cause strange sunsets in the UK

[theincrediblesmiffy]

Red Shift - fascinating!
Its the evidence that the universe is expanding I think
They're all running from us
The scary bit is that it might impolde on us though
Or it could just continue expanding into nothing.. but if space is nothing, what are we expanding into?? Its really confusing.
And the idea of the redness of the sky at sunset..
Is it similar to why water is blue?
Because the density of water makes the higher frequency (light) waves through?
That and the reflection of the sky

[kshotton45]

This was e-mailed to me today.
Apparently you can only see this sunrise if you're on the North Pole .




This was the caption with it .........

" A scene you will probably never get to see, so take a moment and
enjoy God at work at the North Pole.
This is the sunset at the North Pole with the moon at its closest point.
And, you also see the sun below the moon.
An amazing photo and not one easily duplicated. You may want to pass
it on to others. "


Keith.

[Andy Warne]

Unfortunately it is a digitally created image Keith, a pretty one though.

[kshotton45]

Thanks !!!

What a disappointment !!!!!!

Keith.

[carlos_dfc]

Yep - completely fake I'm afraid.

The Sun and Moon both appear roughly half a degree across, as seen from Earth.
We do see minor variations where the Sun may appear very slightly larger than the Moon, and vice-versa, due to orbital idiosyncracies (sp?) - but the difference is only a factor of a couple of percent - there's no way the Moon can ever appear many times the size of the Sun, no matter where you are standing on the Earth.

Also - the Moon is only in cinjunction with the Sun, at 'New Moon', and you don't ever see anywhere near that much of a crescent at 'New-Moon'.
The only place you can see a sideways crescent like that, is from at - or near - the equator.

A nice pic nonetheless - but definitely a 'photoshop' job.