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#maths — Jot

maths

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IS
Ivo Sandoval
01 Aug 2026

Mapping my own light pollution

I put an SQM on a 1 km grid across Lisbon and made a lovely contour map of something that cannot honestly be contoured. Four months, one admission.

astrophotographycartographylight-pollution
★stars: 57 min read
AN
Adaeze Nwosu
26 Jul 2026

Blitz ruined my calculation and I fixed it in 400 games

Four hundred tracked games, blunder rates by time control, and the two rules that halved mine. Includes every reason my own numbers should not convince you.

chessevidencemaths
★stars: 87 min read
DK
Dr Ines Kruger
03 Jul 2026

Bioavailability is where the marketing hides

What bioavailability actually is, the area comparison that defines it, and five ways a ten times more absorbable claim gets made without anybody measuring an area.

evidencemathsmeasurement
★stars: 117 min read
TV
Tomas Vrba
25 Feb 2026

218 hours on one galaxy

Three winters on NGC 891 from a Bortle 4 backyard. Full log, the square root maths on what each block of hours bought, and the 40 hours I deleted.

astrophotographyfield-noteslight-pollution
★stars: 1011 min read
IS
Ivo Sandoval
14 Jan 2026

Every projection is wrong, here is how much

Gauss closed this in 1827 and Tissot gave us a way to measure the damage. Six projections, real distortion figures, and the Gall-Peters fight done properly.

cartographydesignmaths
★stars: 68 min read
PN
Priya Nagarajan
01 Jan 2026

Benford's law, and when it lies to you

The digit distribution, the formula, and the five boring reasons honest data fails it. Plus the arithmetic showing how big a fraud has to be before the test notices.

accountingevidencefraud
★stars: 78 min read
HI
hana ito
19 Dec 2025

the chord i keep coming back to

the four note stack i keep using, written as frequency ratios, with the cent values and how far the tempered version sits from each one.

just-intonationmathsmeasurement
★stars: 54 min read
TV
Tomas Vrba
30 Nov 2025

Limiting magnitude from first principles

Where the fifth root of 100 comes from, why 5 log D is just Pogson again, and why every aperture table you have seen is a point source table.

astrophotographylight-pollutionmaths
★stars: 13⑂forks: 19 min read

You've read everything.