Site Recommendations
Last modified February 26, 2026.
Astronomy
- Daff Moon Phase is an Android app that I used to spot all five naked-eye planets (Mercury, Venus, Mars, Jupiter, and Saturn) in 2020.
- Sunrise and Sunset Calculator not only calculates sunrise and sunset times, but also calculates civil twilight, nautical twilight, astronomical twilight, and solar noon times as well!
Natural Languages
- Pleco is an amazing Chinese dictionary app that I recommend to anyone learning Mandarin.
Math
- Roice Nelson, who developed the massive 120-cell puzzle, also wrote a paper with Henry Segerman on visualizing hyperbolic honeycombs!
- 4D Euclidean Space dissects 4D shapes into layers so you can see how they’re constructed.
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