Chasing a Solar Eclipse in Concorde

Why It Matters

It shows supersonic aircraft can dramatically extend eclipse observation, shaping future aerospace research and rare‑event data collection.

Key Takeaways

• Concorde launched from Gran Canaria to chase 1973 eclipse.
• Flight path designed to skim shadow’s edges, avoiding turns.
• Precise intercept required: within 15 seconds or 1 km.
• Planned 80 minutes totality, limited by shadow speed.
• Hot African runways forced reduced fuel load at takeoff.

Summary

In 1973 a team of scientists used the supersonic Concorde to extend totality of a solar eclipse, flying the only aircraft capable of staying in the Moon’s shadow for an extended period.

Because most African runways were too short and the hot climate reduced lift, the crew chose Gran Canaria’s cooler, long runway. The flight plan called for a southward leg to intersect the shadow over Mauritania, then a curved track across the Sahara. To avoid constant turning, Pierre’s team plotted a straight‑line chord that touched the shadow’s northern edge, crossed to the southern edge, and exited at the northern edge, allowing up to 80 minutes of darkness.

The maneuver required hitting the leading edge of the shadow within a kilometer and 15 seconds; any larger miss would cut totality dramatically. The shadow moved slightly faster than Concorde, so the aircraft would eventually be outrun, making timing critical.

The mission proved that supersonic platforms can provide unprecedented eclipse observation windows, informing future high‑altitude or hypersonic eclipse studies and highlighting the logistical precision needed for such rare scientific opportunities.

Original Description

In 1973, the Concorde did something no passenger jet had ever attempted - it chased the Moon’s shadow across the Sahara Desert during a total solar eclipse.

Flying at supersonic speeds, the aircraft had to meet the shadow at its very leading edge. Pinpoint accuracy was essential, because if they arrived even slightly off timing or position, the opportunity would be lost.

By perfectly joining the front of the moving shadow, Concorde effectively extended totality far beyond what was visible from the ground.

For over an hour, scientists onboard studied the Sun’s corona in near-total darkness, while the Moon’s shadow raced across Africa below.