Day and Night Model
v2.0
Estimate daylight duration by latitude and date, then compare with observations.
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Astronomy
This page groups tools, debunks, and experiments that connect to the tag “Astronomy”.
19 tools24 debunks7 experiments
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Interactive models, calculators, and simulations connected to “Astronomy”.
Location Predictions
v1.1
Generate sunrise, sunset, solar-noon, and celestial-pole predictions from latitude, longitude, and date.
Seasons Simulator
v1.0
Compare the same date at two latitudes to show opposite seasonal daylight patterns on a globe.
Crepuscular Ray Perspective Comparator
v1.6.1
Compare parallel sunlight, anticrepuscular convergence, and a nearby-lamp contrast to explain fan-shaped sky rays with perspective geometry.
Moon Phase Explainer
v1.0
Estimate lunar age, illuminated fraction, and phase name from date, with Sun-Earth-Moon geometry.
Eclipse Geometry Visualizer
v2.0
Show how Sun-Moon angular size and Earth's umbra geometry fit one coherent eclipse model.
Telescope Capability Estimator
v1.0
Estimate magnification, field of view, exit pupil, resolution, and target framing from real telescope and eyepiece specs.
Moon Phase Comparator
v1.1
Compare how the same Moon phase and landmark pattern rotate for different Earth observers at the same UTC moment.
Satellite Visibility Geometry
v1.0
Predict satellite rise, peak, set, and visibility from current TLEs, observer coordinates, and a time window.
Satellite Tracker
v1.1
Replay ISS and geostationary passes on a live globe ground track with horizon elevation and pass scrubber.
Satellite Orbits Explained
v2.0
Compute orbital period, ground speed, and horizon slant range from altitude, then see why TLE plus SGP4 pass tables repeat.
GNSS Positioning Geometry
v2.0
Show how navigation satellites use timing and line-of-sight geometry to determine position.
Live Serial NMEA Reader
v1.2
Connect a USB/serial GPS receiver in the browser and inspect live NMEA data such as fix quality, satellites, DOP, speed, and coordinates.
Star Visibility and Latitude
v1.0
Test how star altitude, circumpolar visibility, and hemisphere-dependent sky access change with latitude.
Sun Path Comparator
v1.2
Compare a standard globe Sun path with a simplified nearby-sun flat-earth dome model and test how their daily predictions diverge at the same latitude and date.
Sunspot Observer
v1.0
Render one real NOAA sunspot-region snapshot for different observers and compare how the same solar pattern rotates with latitude, longitude, and UTC time.
Earth Rotation Speed and Centrifugal g-force
v1.0
Calculate surface spin speed and centrifugal acceleration at any latitude.
Debunks
Claim-by-claim responses tied to the same topic and underlying theory.
A Local Sun Explains Day and Night
v1.5.1
A small nearby Sun moving above a flat plane can explain day and night without a globe.
A Local Moon Explains What We See
v1.1
A small nearby Moon moving over a flat plane can explain Moon phases, lunar orientation, and observations without needing a globe.
We Do Not Feel Earth Moving
v1.0
If Earth rotated and orbited through space, people should feel that motion directly.
Seasons Can Be Explained By A Circling Sun
v1.0
A Sun moving in wider and narrower circles above a flat Earth can explain the seasons without a globe.
Southern Stars Do Not Work On A Globe
v1.0
The southern sky cannot fit a globe model, so reports of southern star motion or a southern celestial pole must be false.
Satellites Are Not Real
v1.0
Satellites are fake, and communication or tracking systems are really just balloons, towers, or fabricated stories.
Antarctica Is An Ice Wall
v1.0
Antarctica is not a continent around the south pole. It is an ice wall around the edge of a flat Earth.
Eclipses Do Not Prove A Globe
v1.0
Lunar eclipses do not prove Earth is round because any shape can cast a round shadow somehow.
Time Zones Are Artificial, Not Geometric
v1.0
Time zones are just man-made schedules, so they do not prove a rotating globe.
Sun Rays Prove A Local Sun
v1.0
Crepuscular rays show the Sun is nearby because the rays spread out visually through clouds.
Why Is The Sun Not Lighting Up Space?
v1.0
If the Sun is real and space is real, space should be brightly lit everywhere. Dark space photos prove the Sun is local, fake, or hidden by a dome.
Sunsets Are Only Perspective
v1.0
The Sun does not go below a curved horizon. It only appears to recede into perspective.
GNSS Works Without Satellites
v1.5
GPS and GNSS are really just ground towers or fake software, so they do not prove anything about satellites or a globe.
Polaris Proves The North Pole Is The Center
v1.0
Because Polaris stays fixed in the north, Earth must be a flat plane centered on the North Pole.
Two Celestial Poles Are Impossible
v1.0
One real sky cannot have both a north and south celestial pole, so globe astronomy must be wrong.
Moon Phases Are Just Earth's Shadow
v1.0
The monthly Moon phases are caused by Earth shadowing the Moon, so the usual Sun-Earth-Moon explanation is unnecessary.
The Moon Is Not A Reflection Of Earth
v2.0
The Moon is a mirror or projection of Earth, its dark patches match our continents and it is not a separate rocky body.
Venus Phases Fit A Flat-Earth Local-Light Story Too
v1.0
Venus phases do not help the globe model because a flat-earth sky could just assign changing light to Venus.
Satellite Dishes Point Too Low To Reach Space
v1.0
Home dishes point too low above the horizon, so they must be aiming at nearby towers instead of satellites.
Satellite Passes Could Just Be Balloons
v1.0
Predicted satellite passes do not prove orbiting objects because balloons could explain moving lights too.
Apollo Moon Landings Were Real
v1.0
Apollo crews never walked on the Moon, the landings were filmed on Earth, often attributed to studio work or Kubrick-style productions.
The Firmament Dome Is Not Real
v1.0
Stars, Sun, and Moon are fixed on a nearby glass-like dome or firmament shell that encloses a flat world.
Blue Sky Is Not A Solid Dome
v1.0
The blue daytime sky is light trapped inside a glass-like firmament barrier rather than sunlight scattered by air.
Experiments
Repeatable observations you can use to test the same topic directly.
Satellite Radio SDR Capture
v1.1
Can you capture a satellite radio downlink with a receive-only SDR at the predicted pass time, frequency, and sky direction the way orbital geometry predicts?
GNSS Sky Block Experiment
v1.0
Does GNSS accuracy degrade when the sky view is restricted, as a satellite-based system predicts?
Space Observation Calendar
v1.1
Do month-ahead astronomy calendars predict real sky events correctly when they are filtered for your location, local time, and hemisphere?
Sunspot Orientation Comparison
v1.0
At the same UTC moment, does the same sunspot pattern rotate with observer location the way globe-Earth viewing geometry predicts?
Moon Orientation Comparison
v1.0
At the same UTC moment, does the same Moon phase and landmark pattern rotate with observer location the way globe-Earth viewing geometry predicts?