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40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
** Future events
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(Scheduling an eclipse; Totality)
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To schedule an eclipse of the sun, which involves a number of related events.
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First we define the events, and then we create a phrase to schedule them:
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{*}"Totality"
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At the time when the penumbra appears:
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say "The sunlight dies away to an eerie, brownish penumbra."
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At the time when the eclipse begins:
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say "The moon passes across the disc of the sun, plunging the world into darkness.";
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now the Chamber is dark.
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At the time when the eclipse ends:
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say "The moon passes away from the sun, and a gloomy penumbral light returns.";
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now the Chamber is lighted.
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At the time when normal sunlight returns:
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say "The sun shines once more bright in the sky, not to be eclipsed again on this spot for another thirty-seven years."
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To schedule an eclipse for (totality - a time):
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the penumbra appears at two minutes before totality;
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the eclipse begins at totality;
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the eclipse ends at three minutes after totality;
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normal sunlight returns at five minutes after totality.
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Now we make use of the new phrase:
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{**}When play begins, schedule an eclipse for 3:27 PM.
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The Chamber is a room.
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The time of day is 3:25 PM.
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Test me with "z / z / z / z / z / z / z / z / z".
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We shall see much more about creating phrases later. Their advantage is that they enable a complicated sequence of operations to be given a meaningful name, and that they can be re-used many times as needed.
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