Indian astronaut Shubhanshu Shukla is set to return to Earth today after completing an 18-day mission aboard the ISS, marking a historic moment under Axiom Space’s Ax-4 program.

Shubhanshu Shukla launched into space as part of the Axiom Mission-4 on June 25 and arrived at the ISS a day later. Here’s all you need to know about Shubhanshu Shukla’s return journey:

Indian astronaut Shubhanshu Shukla is commencing his journey back to Earth July 14 from the International Space Station (ISS). Shukla’s presence on the ISS marks him as the first Indian to board the orbital laboratory and the nation’s second astronaut in space,