Comments on: An underwater diver sees the sun 47° above horizontal. How high is the sun above the horizon to a fisherman in http://www.hobbyfishing.info/fisherman/an-underwater-diver-sees-the-sun-47%c2%b0-above-horizontal-how-high-is-the-sun-above-the-horizon-to-a-fisherman-in Lure them in with us! Wed, 17 Feb 2010 07:15:59 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Rackbrane http://www.hobbyfishing.info/fisherman/an-underwater-diver-sees-the-sun-47%c2%b0-above-horizontal-how-high-is-the-sun-above-the-horizon-to-a-fisherman-in/comment-page-1#comment-8412 Rackbrane Mon, 21 Sep 2009 18:04:59 +0000 http://www.hobbyfishing.info/fisherman/an-underwater-diver-sees-the-sun-47%c2%b0-above-horizontal-how-high-is-the-sun-above-the-horizon-to-a-fisherman-in#comment-8412 Angles of incidence and refraction are measured from the vertical. The diver sees the sun at 47deg. above horizontal. That is: 90 - 47 = 43 deg. to the vertical. The fisherman sees the sun at x deg. above horizontal. That is: 90 - x deg. to the vertical. Therefore: sin(90 - x) / sin(43) = 1.33 cos(x) / sin(43) = 1.33 x = 24.90 deg.<br><b>References : </b><br> Angles of incidence and refraction are measured from the vertical.

The diver sees the sun at 47deg. above horizontal. That is:
90 – 47
= 43 deg. to the vertical.

The fisherman sees the sun at x deg. above horizontal. That is:
90 – x deg. to the vertical.

Therefore:
sin(90 – x) / sin(43) = 1.33
cos(x) / sin(43) = 1.33
x = 24.90 deg.
References :

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