DIY ASTRONOMY
Nov 19, 2020
3 minutes
Make a lunar phase calculator
Create an instrument to show the phase of the Moon on any given date
This month’s project is a mechanical instrument that ‘calculates’ and displays the predicted phase of the Moon for any chosen day of the year. Our design uses a GT2 timing belt and pulleys – commonly used in printers and readily available online – to generate the movement, and we have provided downloadable plans and extra photos and diagrams, so the build should be straightforward.
To use the calculator (pictured, above), you turn the year ring
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