Moon Phase




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This timeline shows the phase of the moon at any day and time and calculates the phases continuously as you move through time. View the timeline in side view to see the full and new moon sequence or turn the view direction towards the past or future and view the moon phase at any specific time.

The example demonstrates drawing in the "endcut" of a event, The endcut is the surface where an event intersects the display time. This provides a useful place to display information about the event at a specific time. The extension used by this example is not part of the qviewer, but is distributed with the examples and loaded into the qviewer when this example is loaded. Extensions can be written and distributed separately from Quotidian when special drawing or calculation is needed.

demonstrates: 
  • An extension that constructs an image based on a time function and draws it on the endcut.
  • Using the "move time to start/end of selection" commands
  • The relation between the time scale and the precision of the printed display time.
things to try: 
  • Slowly move the display time towards the future (by grabbing the circle target and moving it up a small amount). The phase of the moon will slowly change. Note the rough correlation with the month marks on the time ruler.
  • Move the moon category to the left edge of the window (by grabbing the square target and moving it to the left). This makes new moon and full moon events visible behind the image of the moon.
  • Select a full moon event by clicking on a "full" label with the mouse.
  • Select the "move time to end of selection" command missing image. This will move the display time to the end of the full moon event and show the image of the full moon in the endcut. Note that the display time shows only the date of the full moon. The amount of detail printed for the date and time depends on the time scale. As the time scale increases, more and precision is printed.
  • Increase the time scale (moving the triangle target up) until hours and minutes are shown in the display time box. Each moon event is about a minute in duration. This means that the display time is within a minute of the actual full moon.
  • Select a new moon event by clicking on a "new" label with the mouse. (If the time scale is too large to see a new moon event, you can decrease the time scale or move the display time until one is visible.)
  • Select the "move time to end of selection" command missing image. This will move the display time to the end of the new moon event and show an image of the new moon in the endcut.
support files: 
tags: 
Moon, Lunar, Phase, Lunation, Nutation, Full Moon, New Moon
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