Eclipse - lunar/solar
tide
phase of moon
location of moon
angle of sunrise
Solstice / equinox
Analemma
Sunday, March 16, 2025
Wright Brothers
1. "the Wrights calculated they needed an engine that produced at least 8 horsepower and weighed no more than 200 pounds (91 kilograms)."
No such engine was available in the market, so they designed/and made one
They choose aluminum... They painted black - so people did not know the metal (avoid copy)
2. Propeller: Navy's propeller designs were "cut and try".
They used the wind tunnel.
"propeller was a wing traveling in a spiral course".
"90 pounds of thrust to sustain the Flyer in flight at 24 mph" - "combined thrust of between 120 and 130 pounds at 330 rpm"
3. wind tunnel
4. "a highly unstable but controllable machine" (Like Bicycle, flights too...)
No Patent
Few reasons
- Altruism and the Public Good
- Encouraging Innovation
- Financial Constraints
- Open-Source Movements
Examples:
- Wilhelm Conrad Roentgen (X-rays)
- Nikola Tesla (Alternating Current)
- Charles Babbage (Difference Engine)
- Sir Tim Berners-Lee (World Wide Web)
- Linus Torvalds (Linux)
- Richard Stallman (Free Software Movement)
- The Raspberry Pi Foundation (Educational Devices)
- The Wright Brothers (Airplane)
- Thomas Edison (Phonograph)
- Open Source
Marie Curie - "There were no patents. We were working in the interests of science. Radium was not to enrich anyone. Radium... belongs to all people."
Tuesday, March 4, 2025
Apollo-11
The Virtual AGC Project Gemini — Apollo — Shuttle
Apollo 11 guidance computer Github
Virtual Apollo Guidance Computer Github
DSKY - display/keyboard
AGC - Apollo Guidance Computer
CM - Command Module (Colossus) software
LM - Lunar Module (Luminary) Software
https://www.youtube.com/@CuriousMarc
Monday, February 3, 2025
Sudoku 17
010000009000300800000000600000012400703000000500000000800600000000040020000700050
030600080019000000000020000700000450000031000200000000400800000060500000000000900
052400000000070100000000000000802000300000600090500000106030000000000089700000000
092300000000080100000000000107040000000000065800000000060502000400000700000900000
800000001000950000000000000000070420301600000000000000040000570600308000000000200
030500020010000000000090000607000804200300000500000900700080400000100000000000000
200000500000080000000070000031600000000000470000000800000209030400500000060000001
700400000000000500000000300060000890000250000001000000300000042000006070010080000
081000000000800300000000470400000020060300000000900000700021000000050609000000000
070040000000050000000000060000700208900000400000100000300000150008306000000000090
These are minimal Sudoku puzzles using most distinct numbers
Saturday, September 14, 2024
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