The Eclipse Nobody on Earth Can See: Artemis II and the View from Beyond

There are solar eclipses that stop traffic. The 1999 total eclipse drew millions of people to the path of totality across Europe, standing in fields and on clifftops and, in at least one documented case, in borrowed wellies in a Somerset meadow, waiting for the shadow to arrive. The 2024 American eclipse briefly paralysed entire cities. People travel extraordinary distances, spend considerable money and endure considerable weather for the chance to stand in the right place at the right moment.

Today there is a solar eclipse that nobody on Earth will see at all.

Four people get to see it. The other eight billion of us do not."

As the Artemis II crew completes their lunar flyby on 6 April, the sun will move behind the moon from the perspective of the Orion spacecraft, producing a total solar eclipse lasting nearly an hour. During this period the crew will observe the solar corona, the outermost atmosphere of the sun, which is only visible during totality. They will also search for meteoroid impacts on the lunar surface, observe dust above the lunar horizon and look toward deep space targets including planets.

This eclipse exists in a location no human being has occupied since December 1972. The Apollo astronauts who flew around the moon during that programme would have had similar views on certain missions, though the geometry does not always align. What is happening today is, in practical terms, a private showing. Four people get to see it. The other eight billion of us do not.

There is something genuinely strange about that if you think about it for long enough.

Eclipses have carried enormous weight in human culture across every civilisation that has recorded them. The Babylonians predicted them centuries in advance using mathematical cycles they called the Saros, an 18-year repeating pattern that allowed them to forecast exactly when the moon's shadow would fall across specific regions of the Earth. They were not doing this out of idle curiosity. Eclipses were read as messages. The temporary disappearance of the sun was, in virtually every ancient tradition, a moment when the boundary between the ordinary world and whatever lay beyond it became thin.

Chinese court astronomers who failed to predict an eclipse were, in certain dynasties, executed. The stakes attached to reading the sky correctly were not metaphorical. The Aztec calendar revolved partly around eclipse prediction. Greek historians record that a solar eclipse in 585 BC, predicted by Thales of Miletus, stopped a battle between the Lydians and the Medes because both sides took it as a sign from the gods that the fighting should cease. An eclipse literally ended a war.

Medieval European astrologers catalogued every eclipse with meticulous care, cross-referencing them with political upheavals, plagues and the deaths of rulers. The underlying belief, held across cultures that had no contact with each other, was consistent: the sun going dark was not a coincidence. It meant something. The sky was communicating something that attentive observers could learn to read.

Modern astronomy has, of course, replaced that framework with orbital mechanics. We know exactly why eclipses happen and can predict them to the second centuries in advance. The mystery is gone, or at least the explanatory mystery is. What remains, for anyone who has actually stood in the path of totality, is something that resists purely rational description. The temperature drops. Animals behave strangely. The horizon glows in all directions simultaneously with the colours of a 360-degree sunset. The corona blazes around the black disc of the moon in a way that no photograph adequately captures. The experience, even for people who understand completely what is happening and why, tends to produce something that feels very much like awe.

The Artemis II crew will experience a version of that today. A private version, from an altitude no human has occupied in more than fifty years, with the Earth hanging in the darkness behind them and the sun disappearing behind a moon they are close enough to photograph in detail. The crew have already been photographing the moon since day four of the mission, capturing images of the Orientale basin, a vast multi-ring impact crater on the lunar far side that serves as a scientific baseline for comparing impact craters across the solar system from Mercury to Pluto. It is the first time humans have observed this feature from multiple angles directly.

They are, in other words, doing genuine science while also doing something that feels mythological.

The solar corona, which the crew will observe during the eclipse, is one of the stranger features of our sun. It is the outermost layer of the solar atmosphere, extending millions of kilometres into space, and it is significantly hotter than the surface below it, which is the opposite of what basic physics would suggest and which scientists have been trying to explain properly for decades. It is visible from Earth during total eclipses but only briefly, for the two or three minutes of totality that a ground-based observer gets. The Artemis II crew will have nearly an hour.