Eclipse Shadow Track Simulator

Interactive Ephemeris & Umbra Trajectory Engine
📍 Click map to place observer
Shadow Center: 25.3°N, 102.4°W
Ground Speed: 2,410 km/h
Umbra Width: 198 km
Max Totality: 4m 28s
Umbra (Totality)
Penumbra (Partial)
Observer Pin
T - 02:30 Greatest Eclipse (T = 00:00) T + 02:30

Local Obscuration PARTIAL

Observer Location: Mazatlán, Mexico
100.0%
Totality: 4m 20s
Solar Altitude
69.8°
Magnitude
1.056
Sun-Moon Sep
0.02°
Contact Phase
Totality (C2-C3)

Shadow Ray Geometry

The Moon's umbral cone tapers to a vertex ~373,000 km away. If Earth intersects before the vertex, totality occurs; if beyond, an annular ring appears.

Orbital Parameters

Moon Distance (Perigee/Apogee) 363,300 km
Earth Axial Tilt (Season) +7.2° (April)
Why Umbra Speed Exceeds Earth's Rotation
The Moon orbits Earth eastward at ~3,680 km/h. Earth rotates eastward at ~1,670 km/h at the equator. The shadow velocity is the vector difference projected onto Earth's curved spherical crust, typically 1,500 km/h to over 8,000 km/h at grazing incidence.
Umbra vs. Penumbra & Antumbra
Umbra: the inner cone where the Moon completely obscures the Sun's photosphere. Penumbra: the surrounding partial shadow spanning thousands of kilometers. Antumbra: the region beyond the umbral vertex causing an Annular eclipse.
Contact Sequence (C1 through C4)
C1: First bite of partial eclipse. C2: Totality begins with Baily's beads and the Diamond Ring effect. C3: Totality ends. C4: Final partial contact as Moon leaves the solar disk.
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