SolarEclipses.com
Delta T Interactive Graph
Explore ΔT from 1900 through 2200. Hover for the value and source at any plotted instant; zoom and pan to inspect shorter intervals.
Historical / reconstructed
Observed / calculated IERS
IERS predictions
Long-range model
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Sampling cadence is 24 hours for 1900–1950, 12 hours for 1950–1990, 6 hours for 1990–2050, 12 hours for 2050–2100, and 24 hours for 2100–2200. The plotted values are generated from the same data hierarchy and interpolation rules used by the SolarEclipses.com Delta T Calculator.