Why do astronauts seem to wear up to 3 wrist-watches?

Here's some trivia: my company developed the watch worn by the shuttle crew on STS-43: the WristMac! read more

Other watches are worn by astronauts to simply tell the time; and many wear multiple versions such that they can have onboard time (GMT/Greenwich), their family's local time (e.g., Houston) and perhaps a third time of interest (e.g., Russia). read more

Astronauts often choose a second watch of their own to wear in space. The Sinn 142 chronograph has been worn on many spaceflights, as a personal timepiece choice by astronauts. Its first visit to space was on a Space Shuttle Challenger mission in 1985. read more