First we define the events, and then we create a phrase to schedule them:
Now we make use of the new phrase:
Test me with "z / z / z / z / z / z / z / z / z".
The sunlight dies away to an eerie, brownish penumbra.
The moon passes across the disc of the sun, plunging the world into darkness.
It is now pitch dark in here!
The moon passes away from the sun, and a gloomy penumbral light returns.
The sun shines once more bright in the sky, not to be eclipsed again on this spot for another thirty-seven years.
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.