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Stellarium program moon phase full#

To keep this simple, adjust time by hour and minute increments.

Exactly half of the moon should be illuminated, and the terminator should be straight (as opposed to curved).

Set the date: For today, 07/11/16 (time 17:00:00), and adjust the time (increment the minutes) until you see the moon in its first quarter phase (0.50).

Toggle off both the atmosphere and the horizon to better see the phase information. To zoom in on the moon and see its phase, use the forward-slash keystroke (back-slash zooms you back out).

Find the moon: Use the Find Object window to locate the moon, and then click Center on Selected Object (keystroke = space bar).

If Conway is not the default location, you may want to make it the default location.

Open Stellarium: Make sure your location is correctly set for Conway, AR.

Practice locating and referencing objects using celestial coordinates.

Measure the sidereal period of the moon.

Distinguish between synodic and sidereal period of revolution.

We will use the Stellarium program to examine and compare both of these ideas. Like the measure of a sidereal day, the measurement of the sidereal month references the motion of the moon to a stationary star.

Stellarium program moon phase full#

We have the obvious cue of the phase: one month is how long it takes for the moon to complete one cycle of phases, from full moon to full moon (or new to new, or whatever phase you choose). It should not surprise us, then, that the same thing is true of the moon. You cannot say that the moon will always be full on January first, and you cannot say that January ends and February begins precisely at the next full moon.Īs we saw previously, the length of a day depends on how you measure it. Or is it 31? Maybe 28, or even, on occasion, 29? A calendar month can ultimately trace its origin back to the idea of marking time by the cyclic phases of the moon, but there is currently no correlation between any specific day or date and any specific lunar phase. Chapter 13: Neutron Stars and Black HolesĮveryone knows how long a month is.it's 30 days.