Drawing the Moon
2017-12-24
Click to launch
The phase angle of the Moon is defined as zero for a Full Moon, positive for the waning phase, -180° for a New Moon, and negative for the waxing phase.
We draw a disk, a limb (half-circle) and a terminator (half-ellipse), and color the areas according to the phase.
The next step is to compute the phase from the date. As always, my reference is Jean Meeus' book Astronomical Algorithms.
Archive
- Sunset
- À la recherche du temps perdu
- Gibbon's "Decline and Fall of the Roman Empire"
- Book List
- PDF Export - Big Test
- PDF Export - Unit tests
- Precession
- Planet Path - Ecliptic projection
- Ecliptic Projection
- Planet Path
- Zodiac
- Date and time input
- Moon Position
- Hourglass Diagram
- Moon Distance
- Deep Sky Objects
- Sunrise
- Moon Calendar
- Drawing the Moon
- Sky Tiles
- Asteroids and comets
- Variable-width lines
- Solar System 3D representations
- Horizon