Calculating sunrise and sunset between two points

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tiompan T
tiompan Dec 2, 2008 22:45:34
Replying to bawn79

bawn79 wrote:
Sorry all,

I've been checking out a passage tomb and I was wondering if I have an ordnance survey reference for the tomb and an ordance survey for the hill which can be seen from the passage, could anyone on here calculate if any significant sunrise / sunsets are linked to this passage?

Its just a rough estimate I need.

Hi Bawn , I took a guess and checked the Kilmacow wedge wedge tomb to Knockfeerina .It's very imporatnt to have the altitude of both sites but I think I managed to get them from the archaeology ie website .I have assumed that the sighting is to the highest point on the hill which gives a declination of -23.71 very close to winter solstice sunset which is ideally -24 . I'll double check everything tomorrow but I think it's ok .

B bawn79
bawn79 Dec 3, 2008 09:20:41
Replying to tiompan

tiompan wrote:
bawn79 wrote:
Sorry all,

I've been checking out a passage tomb and I was wondering if I have an ordnance survey reference for the tomb and an ordance survey for the hill which can be seen from the passage, could anyone on here calculate if any significant sunrise / sunsets are linked to this passage?

Its just a rough estimate I need.

Hi Bawn , I took a guess and checked the Kilmacow wedge wedge tomb to Knockfeerina .It's very imporatnt to have the altitude of both sites but I think I managed to get them from the archaeology ie website .I have assumed that the sighting is to the highest point on the hill which gives a declination of -23.71 very close to winter solstice sunset which is ideally -24 . I'll double check everything tomorrow but I think it's ok .
Hi Tiompan,
It was actually Shrough (http://www.themodernantiquarian.com/site/8350/shrough.html) in Tipp and Knockfeerina for sunset (http://www.themodernantiquarian.com/site/7901/knockfeerina.html) and Shrough and Sliabh na mBan (http://www.themodernantiquarian.com/site/1530/slievenamon.html) for sunrise. Im not sure which way this passage is oriented but I think it actually may be faced to the west.

I was at the passage grave for sunset two days ago and it is a long way from setting in the passage at the moment.
Does the sun set 'move' very much this time of year (as in position of setting)?

G gjrk
gjrk Dec 24, 2008 12:37:13
Replying to tiompan

Hi tiompan,

Another day, another question! I just saw your answer to a proposal concerning Chun Quoit on another forum and I was wondering how to calculate that 60m distance from the line. Probably some elementary thing that I should remember from school.

There's something around here that I spotted some time back and never got around to going back to the figures to check properly. Perhaps over the Christmas.

Thanks,
Gordon.