Mizusawa (水沢市, Mizusawa-shi) was a city located in Iwate Prefecture, Japan.

The observatories were close to the parallel of 39 degrees 8 minutes north latitude.

They worked together to study the Earth's "wobble" using stars selected by Dr. Kimura, the astronomer in charge of the Mizusawa station.

Two groups of stars were observed at each station following a schedule of dates, time, and duration prepared by Kimura.

This Iwate Prefecture location article is a stub.