Tidal Zone
Science fiction is physics wearing better costumes. Each of these takes a scene seriously enough to compute it, and most scenes do not survive the arithmetic — the ones that do are the interesting part.
Newest in this category
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Biorhythm Calculator
Three sine waves of 23, 28 and 33 days running from your birth date. The periods share no divisor, so the combined pattern repeats only after 21,252 days, about 58.2 years.
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Astrology Birth Chart
Tropical signs anchor to the equinox, and precession has slid them about 24° off the constellations, four-fifths of a 30° sign. The rising sign changes roughly every two hours, so birth time decides it.
- Bitcoin Mining Probability Block times are exponential, so 63% arrive before the expected time and 5% take more than three times it. Ten miners pooling swap a 37.5% swing in daily income for 11.9%, with no extra hashing.
Problems solved in full
What you find out here
- The three curves were never one theory Biorhythm Calculator
- Your sign stopped matching the sky centuries ago Astrology Birth Chart
- The expected time is not the typical time Bitcoin Mining Probability
- The oracle is a six-bit number, and Leibniz said so in 1703 I Ching Divination Mechanics
- Nine days later, the same number — almost always Life Number Calculator
- The only unit in this grid with no sky behind it Life in Weeks
Every tool on this shelf
Astrology Birth Chart
Tropical signs anchor to the equinox, and precession has slid them about 24° off the constellations, four-fifths of a 30° sign. The rising sign changes roughly every two hours, so birth time decides it.
Biorhythm Calculator
Three sine waves of 23, 28 and 33 days running from your birth date. The periods share no divisor, so the combined pattern repeats only after 21,252 days, about 58.2 years.
Bitcoin Mining Probability
Block times are exponential, so 63% arrive before the expected time and 5% take more than three times it. Ten miners pooling swap a 37.5% swing in daily income for 11.9%, with no extra hashing.
Death Star Energy Calculator
How much energy does it take to destroy a planet? Calculate gravitational binding energy and compare it to real-world scales.
Dune Sandworm Intercept Calculator
A worm has length, so the mount point stays open for (D + L) ÷ v seconds instead of one instant. At 1800 m and 22 m/s the margin is 37.27 s, and 45 s of setup delay drops the ceiling from 38.4 m/s to 20.2.
I Ching Divination Mechanics
Cast an I Ching hexagram by coin or by yarrow stalk and watch the two methods disagree. The 64 hexagrams are the 64 six-bit numbers, which Leibniz noticed in 1703, and the two traditional casting methods do not produce the same distribution.
Life in Weeks
Visualize your entire life as a 100-year grid of weeks — see how many you've lived and how many remain.
Life Number Calculator
Add the digits of a birth date until one figure is left. Over 1900 to 2025 six results land on exactly 11.11% each, but 2 gets 3.09% and 4 gets 7.29%, because 11 and 22 take their share from those digits.
Lucky Number Generator
Birthdate folklore picks the numbers, and the arithmetic beside them is real: over 1000 draws of 6 from 49 each ball is expected 122 times, with a standard deviation of 10.4 and a hot-cold gap near 47.
Name Compatibility Calculator
Turn two names into a numerology-style compatibility score using a deterministic letter-value formula - for fun, not for relationship advice.
Neon Lightcycle Duel
TRON-inspired grid duel: watch two AI strategies compete for territory, or play step-by-step with full move analysis before each decision.
Numerology Name Calculator
A=1 to Z=26, summed, then reduced to a digital root, which is the n mod 9 that medieval clerks used to check their sums. Only eleven outcomes exist, so millions of different names share a number.
Pattern Sequence Test
Complete a run of abstract figure sequences (5-20 rounds) and see if your score beats random guessing — scored with exact binomial statistics.
Star Trek Stardate + Warp Visualizer
Warp 9.6 to 9.975 is 0.375 on the dial and roughly 18× in real speed, because the TNG curve divides by (10 − w). One stardate lasts 8 h 45.6 min in a common year and 8 h 47.0 min in a leap year.
Stargate Address Math Dialer
Build a Stargate address by clicking real glyphs, watch 9 chevrons lock one by one, and explore the permutation math behind how many addresses are possible.
Wasteland Signal Mixer
Mix harmonics and noise to reconstruct a target signal in a post-apocalyptic radio game.