About T-ZERO

T-ZERO (t-0.space) is a free, unofficial rocket launch tracker. It shows a countdown to the next launch, a monthly calendar, and lists of upcoming and recent launches from many providers around the world, with filters for provider, rocket, pad / location and country.

Where the data comes from

Launch information comes from Launch Library 2, a public API operated by The Space Devs. The data is cached on this site's server and refreshed about every 30 minutes, so it can lag behind the source and behind real-world events. Launch dates and times change frequently, and some launches only have an approximate date.

Time zones

Times are shown in US Central time by default. A toggle on the home page switches between US Central and your device's local time; your choice is remembered in your browser.

Unofficial and independent

T-ZERO is an independent fan project. It is not affiliated with, sponsored by, or endorsed by any launch provider, space agency, or company. The names of providers, agencies, rockets and missions are used only to identify the launches being described, and belong to their respective owners.

Not for safety-critical use. This site is for general interest only. Do not rely on it for safety-of-life, navigation, range-safety, airspace, maritime or other official information. For official information, consult the launch provider or the relevant authority.

Companion project

T-ZERO also has a companion project, a Roku channel, which is still in development.

Contact

The site is run by Matthew Tuescher. Questions, corrections or takedown requests: matthew@mytestingarena.com.

See also the Privacy Policy and Terms of Use.