Calc Menu (Main Window)
This menu controls how the satellite positions are calculated. The
positions are always calculated for specific time intervals (e.g. 10 seconds
apart). This interval is the "resolution". The actual rate of the calculation
depends on the mode and can be the same as the resolution (real
time), at some other selected rate (e.g. 10 minute intervals calculated
every 15 seconds) (pseudo-real time) or manually (e.g. 10 minute
intervals, updated when the button is clicked) (step mode). This allows
speeded-up and stop-action displays in addition to the real-time mode, for
investigation of satellite behavior in the past or future, or other purposes.
The first group of options controls the Mode
Step (alt-C, S; or shift-F6) - Selects step mode. Two buttons - "fwrd" and "back" appear in the Main window to control the updating of position. Date and time may also be entered directly in the UTC Date and Time box, in which case the display updates when a "return" is typed.
Pseudo-real Time (alt-C, P; or ctrl-F6) - Selects pseudo-real-time mode. A scroll-bar appears in the Main window to control the update rate.
Real Time (alt-C, R; or F6) - Selects real-time tracking. The satellite positions are calculated at the current clock time. Updates are done every "interval" seconds.
The next group of options sets or resets the program's clock.
Now (alt-C, N; or F5) - Reset the display time to Now by reading the computer's clock. Useful when returning to real-time mode after step mode, for example.
Reference (alt-C, f; or F7) - Reset the display time to the reference epoch
of the currently selected satellite. The tracking mode is set to Step
at the same time.
Four other options generate displays of detailed information in the Report Window:
Show Position (Inertial or Geodetic) (alt-C, I; or alt-C,G) - Pops up the Report Window and displays the current position
in the specified format.
Show Next Pass (alt-C, x; or F9) - Pops up the Report Window and
for the next visible pass of each satellite, up to 48 hours from now.
Show Visible Sats (alt-C, V; or ctrl-F9) - Pops up the Report
Window to display a list of satellites visible ("What's Up"). The
list in the current
Display and Window Overview
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