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- SSSSUUUUNNNNCCCCLLLLOOOOCCCCKKKK((((GGGG)))) UUUUNNNNIIIIXXXX VVVV SSSSUUUUNNNNCCCCLLLLOOOOCCCCKKKK((((GGGG))))
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- NNNNAAAAMMMMEEEE
- sunclock - show illuminated portion of Earth
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- ssssuuuunnnncccclllloooocccckkkk [ _o_p_t_i_o_n_s ]
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- _s_u_n_c_l_o_c_k is an X11 application that displays a map of the
- Earth and indicates the illuminated portion of the globe by
- drawing sunlit areas dark on light, night areas as light on
- dark. It also displays the current date and time.
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- OOOOPPPPTTTTIIIIOOOONNNNSSSS
- The program does not use the X Toolkit, and hence only those
- options explicitly enumerated below may be used. Neither
- are any resources used.
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- ----vvvveeeerrrrssssiiiioooonnnn
- Show program version and patch level, and then exit.
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- ----ddddiiiissssppppllllaaaayyyy _d_i_s_p_n_a_m_e
- Give the name of the X server to contact.
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- ----iiiiccccoooonnnniiiicccc
- Start iconic. Usually you will want to specify this
- option.
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- ----ggggeeeeoooommmmeeeettttrrrryyyy +_x+_y
- Specify the position of the window. Only the position
- is used; any size information given is ignored.
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- ----iiiiccccoooonnnnggggeeeeoooommmmeeeettttrrrryyyy +_x+_y
- Specify the position of the icon. Only the position is
- used; any size information given is ignored.
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- HHHHOOOOWWWW IIIITTTT WWWWOOOORRRRKKKKSSSS
- _s_u_n_c_l_o_c_k calculates the position of the Sun using the
- algorithm in chapter 18 of:
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- _A_s_t_r_o_n_o_m_i_c_a_l _F_o_r_m_u_l_a_e _f_o_r _C_a_l_c_u_l_a_t_o_r_s by Jean Meeus, Third
- Edition, Richmond: Willmann-Bell, 1985.
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- and Mercator projects the illuminated area onto map image.
- The Sun's position is calculated to better than one arc-
- second in accuracy.
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- BBBBUUUUGGGGSSSS
- The maps are not rescaled if you resize the open window or
- icon. (I don't want to have to store a vector database for
- the map.) The program contravenes section 4.1.9 of the
- ICCCM in that its icon window is a fixed size, and any
- WM_ICON_SIZE property of the root window is ignored.
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- Page 1 (printed 2/21/91)
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- The illuminated area shown is the area which would be sunlit
- if the Earth had no atmosphere. The actual illuminated area
- is larger because of atmospheric refraction and twilight.
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- AAAAUUUUTTTTHHHHOOOORRRR
- John Mackin, Basser Department of Computer Science,
- University of Sydney, Sydney, Australia; <john@cs.su.oz.AU>.
- Based on a Suntools program by John Walker, Autodesk, Inc.;
- <kelvin@acad.uu.NET>.
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- Page 2 (printed 2/21/91)
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