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Re: New pic

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No, Nigel, Moth was right. The principle of ray-tracing can be used to prove it. If you were to stand at the point where the top of the shadow strikes the ground and look back up at the hill (wait for a cloud so you don't hurt your eyes), you would not be able to see the flat top. What you would see is the curved edge around the summit and it is this that is creating the top part of the shadow, elongated into a semi-ellipse because of the angle of the sun. If you can't be bothered to travel to Silbury to try this, then hold a coin horizontally at arms length in front of you a few inches above eye level and look up at it. Can you see the top surface or do you just see the curved edge?

Reply | with quote

Posted by Steve Gray
26th November 2003ce
12:26

In reply to:

Re: New pic (nigelswift)

1 reply:

Re: New pic (nigelswift)

Messages in this topic:

Photography Competition

(nigelswift, Nov 22, 2003, 08:41)

Forgot to Say... (nigelswift, Nov 22, 2003, 08:59)
- Re: Forgot to Say... (Cursuswalker, Nov 23, 2003, 14:20)
Specifications? (Moth, Nov 22, 2003, 09:12)
- Re: Specifications? (nigelswift, Nov 22, 2003, 10:03)
  - Re: Specifications? (Moth, Nov 22, 2003, 10:48)
Re: Photography Competition (Pete G, Nov 22, 2003, 14:36)
- Re: Photography Competition (Pete G, Nov 22, 2003, 14:43)
  - oops (Pete G, Nov 22, 2003, 14:50)
    - Peachy (nigelswift, Nov 22, 2003, 16:42)
      - Re: Peachy (Pete G, Nov 22, 2003, 17:10)
      - Not to be mist!!! (Moth, Nov 22, 2003, 21:55)
Re: Photography Competition (Steve Gray, Nov 23, 2003, 11:12)
- Re: Photography Competition (The Sizewell Bee, Nov 23, 2003, 13:00)
  - Re: Photography Competition (Pete G, Nov 23, 2003, 14:28)
    - Re: Photography Competition (nigelswift, Nov 23, 2003, 15:59)
      - Re: Photography Competition (BlueGloves, Nov 23, 2003, 22:01)
        Re: Photography Competition (Pete G, Nov 23, 2003, 22:50)
        Re: Photography Competition (Hob, Nov 23, 2003, 23:16)
        Re: Photography Competition (BlueGloves, Nov 24, 2003, 07:20)
        Re: Photography Competition (Steve Gray, Nov 24, 2003, 08:54)
        Re: Photography Competition (Pete G, Nov 24, 2003, 10:06)
        Re: Photography Competition (BlueGloves, Nov 24, 2003, 12:19)
        Re: Photography Competition (nigelswift, Nov 24, 2003, 13:02)
        Re: Photography Competition (Steve Gray, Nov 24, 2003, 14:37)
        Re: Photography Competition (Pete G, Nov 24, 2003, 13:44)
        Re: Photography Competition (BlueGloves, Nov 24, 2003, 14:58)
        Re: Photography Competition (nickbrand, Nov 24, 2003, 15:35)
        Re: Photography Competition (Pete G, Nov 24, 2003, 15:43)
        Re: Photography Competition (nickbrand, Nov 24, 2003, 15:45)
        Re: Photography Competition (Moth, Nov 24, 2003, 15:53)
        Re: Photography Competition (BlueGloves, Nov 24, 2003, 16:17)
        Re: Photography Competition (BlueGloves, Nov 24, 2003, 20:51)
        Re: Photography Competition (Pete G, Nov 24, 2003, 21:04)
        Re: Photography Competition (BlueGloves, Nov 24, 2003, 22:03)
        Crop circle heat patterns (Steve Gray, Nov 24, 2003, 22:36)
        Re: Crop circle heat patterns (BlueGloves, Nov 25, 2003, 08:29)
        Re: Crop circle heat patterns (Steve Gray, Nov 25, 2003, 14:55)
        Re: Crop circle heat patterns (Pete G, Nov 25, 2003, 22:56)
        Re: Crop circle heat patterns (BlueGloves, Nov 25, 2003, 23:08)
        BUT (Pete G, Nov 25, 2003, 23:28)
        Also (Pete G, Nov 25, 2003, 23:41)
        Re: Also (The Sizewell Bee, Nov 26, 2003, 06:34)
        Re: Also (Pete G, Nov 26, 2003, 12:27)
        Re: Also (gm, Nov 26, 2003, 12:35)
        Don't worry about it, Pete (BlueGloves, Nov 26, 2003, 08:12)
        just to put my oar in (Rhiannon, Nov 26, 2003, 09:32)
        Re: just to put my oar in (BlueGloves, Nov 26, 2003, 20:54)
        Re: Don't worry about it, Pete (Pete G, Nov 26, 2003, 12:28)
        Re: Don't worry about it, Pete (Steve Gray, Nov 26, 2003, 12:51)
        Re: Don't worry about it, Pete (Pete G, Nov 26, 2003, 12:59)
        Re: Don't worry about it, Pete (AtomicMutton, Nov 28, 2003, 09:33)
        Re: Don't worry about it, Pete (Steve Gray, Nov 28, 2003, 10:25)
        Re: Don't worry about it, Pete (nigelswift, Nov 28, 2003, 11:06)
        Re: Don't worry about it, Pete (Steve Gray, Nov 28, 2003, 11:40)
        Pits (Pete G, Nov 28, 2003, 12:09)
        Re: Don't worry about it, Pete (AtomicMutton, Nov 28, 2003, 12:34)
        Re: Don't worry about it, Pete (nigelswift, Nov 28, 2003, 12:44)
        Re: Crop circle heat patterns (nigelswift, Nov 26, 2003, 07:57)
        Re: Crop circle heat patterns (Steve Gray, Nov 26, 2003, 12:13)
        Not a bad explanation (BlueGloves, Nov 26, 2003, 20:19)
        Lifters (Steve Gray, Nov 27, 2003, 09:09)
        Lifters (sorry Gandalf) (BlueGloves, Nov 28, 2003, 15:02)
        Re: Lifters (sorry Gandalf) (nigelswift, Nov 28, 2003, 15:30)
        Re: Lifters (sorry Gandalf) (Pete G, Nov 28, 2003, 15:34)
        Re: Lifters (Gandalf's ok) (BlueGloves, Nov 28, 2003, 17:42)
        Re: Lifters (sorry Gandalf) (Steve Gray, Nov 28, 2003, 17:58)
        Re: Lifters (BlueGloves, Nov 28, 2003, 19:18)
        Re: Lifters (Steve Gray, Nov 29, 2003, 14:13)
        The all knowing gun toting executioner (suave harv, Nov 29, 2003, 15:23)
        answer (Pete G, Nov 29, 2003, 15:31)
        Re: Photography Competition (nigelswift, Nov 24, 2003, 22:40)
        Re: Photography Competition (Steve Gray, Nov 24, 2003, 22:41)
        Re: Photography Competition (Pete G, Nov 24, 2003, 22:42)
        Re: Photography Competition (Steve Gray, Nov 24, 2003, 14:57)
      - Re: Photography Competition (Pete G, Nov 24, 2003, 00:12)
Re: Photography Competition (Kozmik_Ken, Nov 24, 2003, 09:45)
- Re: Photography Competition (nigelswift, Nov 24, 2003, 14:36)
Re: Photography Competition (Moth, Nov 24, 2003, 10:02)
HA Photography Comp pics (Kozmik_Ken, Nov 25, 2003, 12:26)
- Re: HA Photography Comp pics (The Sizewell Bee, Nov 25, 2003, 13:06)
- Re: HA Photography Comp pics (jimit, Nov 25, 2003, 13:33)
- Re: HA Photography Comp pics (Kozmik_Ken, Nov 25, 2003, 13:41)
- New pic (Pete G, Nov 25, 2003, 15:54)
  - Re: New pic (Kozmik_Ken, Nov 25, 2003, 15:59)
    - Re: New pic (Kozmik_Ken, Nov 25, 2003, 16:04)
  - Re: New pic (nigelswift, Nov 25, 2003, 16:19)
    - Re: New pic (Pete G, Nov 25, 2003, 16:24)
      - Re: New pic (nigelswift, Nov 25, 2003, 16:33)
        Re: New pic (Pete G, Nov 25, 2003, 16:35)
        Re: New pic (Moth, Nov 25, 2003, 16:40)
      - Re: New pic (Moth, Nov 25, 2003, 16:34)
        Re: New pic (nigelswift, Nov 25, 2003, 16:36)
        Re: New pic (Pete G, Nov 25, 2003, 22:36)
        Re: New pic (Steve Gray, Nov 26, 2003, 12:26)
        Re: New pic (nigelswift, Nov 26, 2003, 12:40)
        Re: New pic (Steve Gray, Nov 26, 2003, 12:55)
- Re: HA Photography Comp pics (Nat, Nov 25, 2003, 15:57)
  - Re: HA Photography Comp pics (Moth, Nov 25, 2003, 16:05)
    - Re: HA Photography Comp pics (Kozmik_Ken, Nov 25, 2003, 16:14)
      - Re: HA Photography Comp pics (nigelswift, Nov 25, 2003, 17:11)
        Last call for any more entries? (Pete G, Nov 25, 2003, 17:15)
- Re: HA Photography Comp pics (Jane, Nov 26, 2003, 11:18)
  - Oi!!! (Moth, Nov 26, 2003, 11:30)
    - Re: Oi!!! (nigelswift, Nov 26, 2003, 11:43)
    - Re: Oi!!! (Jane, Nov 26, 2003, 12:55)
      - Re: Oi!!! (nigelswift, Nov 26, 2003, 12:59)
        Re: Oi!!! (Moth, Nov 26, 2003, 13:40)
        Re: Oi!!! (nigelswift, Nov 26, 2003, 13:50)
        Editor Swifty (Moth, Nov 26, 2003, 19:48)
re consolidation and top of Silbury (moss, Nov 29, 2003, 18:29)
- Re: re consolidation and top of Silbury (moss, Nov 29, 2003, 19:03)
December pic (Pete G, Dec 14, 2003, 17:35)
- Re: December pic (nigelswift, Dec 14, 2003, 18:09)
  - Nigel! (Moth, Dec 14, 2003, 18:19)
- Re: December pic (morfe, Dec 14, 2003, 18:15)

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