Artemis II Enters Moon's Sphere of Influence: Flyby Today

Published: 6 April 2026 . The English Chronicle Desk. The English Chronicle Online—Tracking the return of humanity to the deep-space frontier.

In a major celestial milestone, the four astronauts of NASA’s Artemis II mission officially entered the Moon’s “sphere of influence” in the early hours of Monday, 6 April 2026. At 12:37 AM EDT, the Orion spacecraft, Integrity, reached the invisible tipping point in space where the lunar gravitational pull finally surpassed the fading tug of Earth. The transition, occurring four days and six hours into the 10-day mission, signals the start of the most critical phase of the journey: the first crewed lunar flyby in more than half a century.

At the moment of the “handover,” Orion was approximately 39,000 miles (62,800 km) from the lunar surface and roughly 232,000 miles (373,400 km) from Earth.

The “Sphere” Explained: Entering the sphere of influence means the Moon’s gravity is now the primary force dictating Orion’s speed and trajectory. As the ship “falls” toward the Moon, its velocity will naturally increase, setting the stage for the gravitational slingshot that will eventually whip the crew back toward home.
A 54-Year First: This is the first time humans have occupied lunar space since the departure of the Apollo 17 crew in December 1972. “For the first time in my lifetime, humans are back at the Moon,” said NASA Deputy Associate Administrator Lori Glaze. “Our flight operations and science teams are ready for history.“

The entry into the lunar sphere is just the prologue to a high-stakes Monday schedule.

The Flyby Window: The official “Lunar Observation Period” begins at 2:45 PM EDT. During this six-hour window, the crew—Reid Wiseman, Victor Glover, Christina Koch, and Jeremy Hansen—will point Orion’s main windows toward the gray, cratered dirt below to conduct 35 specific scientific objectives.
The Record-Breaker: At 1:46 PM EDT, the crew is expected to officially surpass the all-time human distance record from Earth (248,655 miles), set by the Apollo 13 crew in 1970. By tonight, they will reach a maximum distance of 252,757 miles.
The Solar Eclipse: As they round the Moon, the crew is expected to witness a rare celestial sight: a solar eclipse from space, where the Sun is hidden behind the lunar disk, leaving only the glowing solar corona visible to the naked eye.

While the crew prepares for their close approach, the mission has not been without its technical “hiccups.” NASA flight directors confirmed today that minor issues with the spacecraft’s Universal Waste Management System (the deep-space toilet)—including a frozen dump line and low water levels—have been “resolved and are currently operating nominally.” The crew also completed a rigorous “suit-up” test on Sunday, practicing how quickly they could don their pressurized Orion Crew Survival System suits in the event of an emergency.

“We’re focusing very much on the ecosystem,” said NASA official Jared Isaacman. “This is the first time astronauts have ever flown on this spacecraft, and that’s the data we need to get back to the Moon to stay.” As Orion accelerates toward its 7:05 PM EDT closest approach, the world waits for the first live high-definition images of the lunar far side—a view that, until today, has belonged only to history and the machines.

Artemis II: Lunar Sphere of Influence Data (6 April 2026)

Metric	Status / Value
Entry Time	12:37 AM EDT, 6 April
Distance to Moon	39,000 Miles (at entry)
Distance to Earth	232,000 Miles (at entry)
Closest Approach (Target)	~4,600 Miles (7:05 PM EDT)
Max Distance from Earth	252,757 Miles (Tonight)