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- SB SPACE @ ARL $ARLS021
- ARLS021 Test part 3 of 5
-
- ZCZC AS01
- QST de W1AW
- Space Bulletin 021 ARLS021
- From ARRL Headquarters
- Newington, CT April 23, 1993
- To all radio amateurs
-
- SB SPACE ARL ARLS021
- ARLS021 Test part 3 of 5
-
- MISSION ELAPSED TIME:
-
- How do you plan for timing Orbit 61 and Orbit 62 when you only
- know an approximate launch time? The best planning tool is
- Mission Elapsed Time (MET). That's what NASA uses to schedule
- crew operating schedules.
-
- With MET, you start counting time at liftoff. Think of it this
- way: During countdown, the clock moves backward ("T minus 10, 9,
- 8 seconds, and all that). At the moment of liftoff, the clock
- starts moving forward.
-
- As an example, let's say the actual launch time is April 24 at
- 14:00 UTC. Since Orbit 61 nears North America at Mission Elapsed
- Time 3 days 18 hours and 3 minutes (3/18:03 MET), then add this
- to the new launch time:
-
- Apr 24 14:00 UTC +
- 3 days 18:03 MET = April 27 at 32:03 or April 28 at 08:03 UTC
-
- As a result, for a April 24 launch at 14:00 UTC, Orbit 61 will
- occur on April 28 at 08:03 UTC.
-
- Because of launch delays, MET is the only reasonable way to
- figure time during a mission.
-
- W1AW will broadcast bulletins during the mission announcing the
- actual launch time and Orbit 61 and 62 times for this experiment.
- NNNN
- /EX
-