> Date: Sun, 29 Apr 2001 17:00:24 -0400 > From: Jonathan T Wojack <tlj18@juno.com> > To: SeeSat-L@blackadder.lmsal.com > > > The formula for maximum surface distance on the Earth (in > > kilometers) an > > object at HEIGHT (also in kilometers) can be seen is given by: > > At the calculated distance - at what altitude is the object above the > observer's horizon? > > > DIST = 6371 * {arccos[6371/(6371 + HEIGHT)] / 57.29577} > > I'm not familiar with the term "arccos". How does it differ from the > mathematical function cosine? Jonathan, The arccos is the inverse of the cosine. Mathematically it is denoted as cos**-1 (x) .... 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. Anthony. > - ---------------------------- > Jonathan T. Wojack tlj18@juno.com > 39.706d N 75.683d W > > 4 hours behind UT (-4) ----------------------------------------------------------------- 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
This archive was generated by hypermail 2b29 : Mon Apr 30 2001 - 14:58:38 PDT