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DATELINE
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Text File
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1991-05-22
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2KB
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43 lines
rem This file draws the International Date Line on
rem Geoclock maps. The date line is indeterminate
rem in Arctic and Antartic regions.
rem
rem The data can be put into GEO*.DAT files for
rem automatic display on maps by using the
rem expression INCLUDE DATELINE (assuming that
rem this file is in the Geoclock directory).
rem Alternatively, the relevant portion of the
rem data can be written into a GEO*DAT file.
rem
drawline 75.00 -180.00 68.00 -169.00 5
drawline 68.00 -169.00 65.50 -169.00 5
drawline 65.50 -169.00 58.952 -180.00 5
drawline 58.952 180.00 53.00 170.00 5
drawline 53.00 170.00 48.00 180.00 5
drawline 48.00 180.00 -5.00 180.00 5
drawline -5.00 -180.00 -15.00 187.50 5
drawline -15.00 187.50 -45.00 187.50 5
drawline -45.00 187.50 -51.00 -180.00 5
drawline -51.00 180.00 -60.00 180.00 5
rem
rem The third and fourth lines are actually one
rem straight line, jury-rigged to eliminate a problem
rem in Map 6 (Alaska). For all other relevant maps,
rem the following line would have been sufficient.
rem drawline 65.5 -169.0 53.0 170.0 5
rem
rem This file matches most maps, but not an "official"
rem definition. The official definition substitutes
rem the following for the first two lines:
rem drawline 75.0 180.0 65.5 -169.0 5
rem But the "official" definition apparently leaves
rem both Diomede Islands on the east side of the line,
rem though one of them is Russian and the other U.S.
rem
rem
rem added 22.5.1991 by Henkjan Olthuis:
rem
rem the version of this file I downloaded from the BBS did not work
rem correctly with maps 18, 19 & 23: there were lines drawn where they
rem should not have been. The problem was with the lines 7 & 9, but was
rem easily solved by changing 180 to -180 and -172.5 to 187.5