Shareware Overload/ShartewareOverload.cdr/games/apollo.zip/11.CMT

Text File | 1986-11-17 | 6KB | 189 lines

******  BEGIN  ***  TUTORIAL  ***  # 1 - 1  ******
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Tutorial # 1-1 begins with the Pilot onboard the LOL
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..and ends before transfer to and checkout of the LM.
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As the mission begins, the Pilot is in the LOL
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..near the east limb of the near side of the Moon
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..moving west in a 100km circular orbit.
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*** LOOK AT THE INS DISPLAY *** It is in "POSition-ABSolute" mode.
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The first row of the display (left to right) indicates that the LOL is
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..at an altitude of about 100,130 m
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..at about 86.5° east longitude
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..slightly north of the Lunar equator (0° latitude).
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The second row indicates that the LOL is
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..slowly losing altitude (+0.2 m/s)
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..moving west at 1633.9 m/s
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..slowly moving south at less than 0.05 m/s.
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The third row indicates that the LOL is
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..under the influence of Lunar gravity (-1.5 m/s²)
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..slowly increasing its westward velocity (value less than zero)
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..slowly accelerating south (value less than zero).
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Notice two things about the altitude displays:
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(1) While in orbit, a vertical velocity of +0.7 m/s indicates that
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..the LOL or LM is moving parallel to the Lunar surface, i.e.,
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..the altitude remains constant.
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A vertical velocity of +0.2 m/s, therefore, indicates that
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..the LOL is losing altitude at a rate of about 0.5 m/s.
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Verify the 0.5 m/s drop by watching the altitude display for a few seconds.
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(2) While in orbit, a vertical acceleration of -1.5 m/s² is balanced by
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..the "centrifugal" acceleration, resulting in no net change in velocity.
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Verify the constant vertical velocity of +0.2 m/s by watching the display.
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The INS display is set to "POSition-TARget" mode.
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The second and third rows of the INS display do not change.
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In the AMS, all points on the Lunar surface are at zero altitude so
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..the altitude remains the same as well.
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The east and north displays on the first row show the distance to
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..the landing site which, for the Tutorials,
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..is at 0.675° north latitude by 23.435° east longitude
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..near the abandoned Apollo 11 Descent Stage.
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Note, while switching between "POS-ABS" and "POS-TAR", that differences
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..between the east and north values are about 23.4° and 0.7°, respectively.
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The INS display is set to "POSition-RELative" mode.
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The relative position and velocity are zero, indicating that the LM is docked.
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The INS display is set to "ORBit-ABSolute" mode.
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The first column of the orbital display (top to bottom) indicates that
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..the LOL is in a nearly circular orbit with
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..a perilune (low point) of 99.9 km
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..an apolune (high point) of 100.6 km.
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The top row of the orbital display (left to right) indicates that
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..the angular momentum vector is very near the Lunar north pole.
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The east component is -83.00°, indicating that
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..the orbit is tilted toward -83.00° east longitude.
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The north component is 90.00°, indicating that
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..the plane of the orbit is tilted by less than 0.005° from the Lunar equator.
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The orbital time is 1 h 57 min 50 s and is displayed at the lower right.
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The INS display is set to "ORBit-TARget" mode.
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The first column of the orbital display remains the same.
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The angular momentum vector is displayed relative to the landing site.
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Note that as the display is switched between "ORB-ABS" and "ORB-TAR" modes
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..the east and north components differ by 23.4° and 0.7°, respectively.
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The INS display is set to "ORBit-RELative" mode.
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The display is all zeros since the LM and LOL are docked.
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The INS display is set to "POS-TAR" mode.
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The AMS is put into FASTTIME mode.
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The AMS runs about twice as fast as in REALTIME mode
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..and all of the displays are updated.
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The AMS is put into VERYFAST mode.
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Now the AMS runs about ten times faster than REALTIME
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..and only the timer displays are updated.
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Use the Time Flow commands to quickly advance while nothing much is happening.
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The AMS runs in VERYFAST mode until the LOL passes near the landing site.
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The LOL is passing directly south of the landing site.
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The east position changes by about 0.05°/s
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..so it takes about 20 s to travel one degree.
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The LOL has passed the landing site and is about 22° east of
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..the sub-Earth meridian as seen by switching to "POS-ABS" mode.
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The next major events -- terminator and perilune -- occur at about UT 08:49.
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The LOL is approaching the terminator at 8.1° east longitude
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..a line separating the sunlit and dark sides of the Moon.
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At the start of a mission, the terminator is 15° west of the landing site
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..and moves west at about 0.51° per hour.
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The LOL is also nearing perilune, its closest approach to the Lunar surface.
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The LOL altitude roughly agrees with the value calculated for the perilune
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..99630 m altitude versus 99.9 km perilune.
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Orbital parameters are difficult to calculate and will vary by
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..a few percent at different locations along the orbit.
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The altitude is constant while the vertical velocity is +0.7 m/s.
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Watch as the altitude slowly begins to rise from 99,630 m.
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The LOL is approaching the sub-Earth meridian
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..the center of the visible face of the Moon.
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*** LOOK AT THE BODY AXIS DISPLAYS ***
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The LOL Face axis is pointing toward the north
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..and the LOL Left axis is pointing nearly straight up toward the Earth.
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The LOL has passed the sub-Earth meridian.
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This concludes TUTORIAL # 1-1 ... The mission continues with TUTORIAL # 1-2.
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