**Next in thread:**Anthony Ayiomamitis: "Re: Maximum distance to launch ground tracks"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

> > If you are using the calculator within Windows, for example, you will see a > button for COS and also another for INV. If you want the arccos, ie. the inverse of > the cosine, enter your value, hit the INV box to check it off and then hit COS. > Mathematically, arccos returns a value in radians = 180 degrees / PI() = 57.29578 The formula given assumes it is returned in degrees, which is the default in Windows' Calc, but not in Excel and other programming systems - be careful about that (also you should select menu View / Scientific to SEE the functions - in Standard cos and arccos can be used by TYPING o and io) Anthony also asked 'at what altitude is the object '- this formula is for 0 degrees, on (see-level) horizon. To find the ground range for another value, use the same formula for another Earth radius, then subtract the distance corresponding to the elevation you want (a). With R=6371 km and a in degrees: DIST = R * {arccos[cos(a)*R/(R+HEIGHT)] / 57.29578} - a * R / 57.29578 assuming your calculator works completely in degrees. If using radians, use DIST = R * arccos[cos(a / 57.29578)*R/(R+HEIGHT)] - a * R / 57.29578 With HEIGHT = 200 km, this gives for a=0 DIST=1576 a=5 DIST =1113 a=10 DIST = 810 ... a=85 DIST = 17 ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html

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