Earth science calculators
Geodesy, seismology, atmospheric, and ocean hazard estimates.
5 calculators
Earth Curvature Calculator
Hidden height below horizon and drop from distance over a spherical Earth. Use the calculator above. Use the calculator above. Use the calculator above.
Earthquake Energy Comparison
Energy ratio between two Richter magnitudes (log10 energy scale). Use the calculator above. Use the calculator above. Use the calculator above.
Geodesic Distance & Azimuth Calculator
Haversine great-circle distance and initial bearing between two lat/lon points. Use the calculator above. Use the calculator above.
Sun Position Calculator
Simplified solar elevation from latitude, declination, and hour angle. Use the calculator above. Use the calculator above. Use the calculator above.
Tsunami Speed & Arrival Calculator
Shallow-water wave speed √(g×depth) and arrival time from distance. Use the calculator above. Use the calculator above. Use the calculator above.