Moon image icons derived from NASA moon photographs
This distribution contains images from NASA for a full month of views at 3 hour intervals which are rendered at the MP4 file at https://svs.gsfc.nasa.gov/4310/
Credit: NASA's Scientific Visualization Studio, Visualizer: Ernie Wright (USRA)
It was downloaded as media1.mp4, then processed by
to create an animated GIF, then the animated GIF was processed by
to extract the individual 1920x1080 frames as separate images.
The images were renamed from 'frame_nnn_delay-m.mms.gif' to 'moon_nnn.gif' where 'nnn' is the frame number and saved in the ./NASA-moons/ directory.
Per NASA docs:
- This short looping animation (MP4) shows a complete cycle of lunar phases.
- The view is geocentric, lunar north up.
- The frames are at intervals of 3 hours, with a total length of 236 frames representing a synodic month of 29.5 days.
- To find the frame number corresponding to a particular age in days, use the formula
frame number = ( days × 8 ) + 1
Then using that formula, days=0..29 images were selected and reprocessed by PHP GD to produce the ,/moonimg/ 50x50 transparent gif images (gen-moon-images.php)
Note: the Southern Hemisphere images were created by rotating the Northern Hemisphere images by 180 degrees.
Icon: ./moonimg/NH-moon14.gif
Icon: ./moonimg-lg/NH-moon14.gif
Source image: ./NASA-moons/moon_125.gif
