The National Astronomical Observatory of Japan is situated in Mitaka-city, to the west of Tokyo. It can be reached in the following way.

Map from Narita to NAOJ Mitaka

Tokyo Station is the starting station of Chuo line. You can sit down and relax till the train arrives at Musashi-sakai Station. Note that special rapid train does not stop at Musashi-sakai. The timetable and other information are avaiable from JR N'EX webpage (http://www.jreast.co.jp/e/nex/index.html).

Route 1

Narita Airport ==(JR/ Narita Express "N'EX")==> Tokyo (53min / 2,940yen)
Tokyo ==(JR/ Chuo line)==> Musashi-sakai (34min / 450yen)
Tokyo Station is the starting station of Chuo line. You can sit down and relax till the train arrives at Musashi-sakai Station. Note that special rapid train does not stop at Musashi-sakai. The timetable and other information are avaiable from JR N'EX webpage (http://www.jreast.co.jp/e/nex/index.html).

Route 2

Narita Airport ==(JR/ Airport Narita)==> Tokyo (83min / 1,280yen)
Tokyo ==(JR/ Chuo line)==> Musashi-sakai (34min / 450yen)
Tokyo Station is the starting station of Chuo line. You can sit down and relax till the train arrives at Musashi-sakai Station. Note that special rapid train does not stop at Musashi-sakai.

Route 3

Narita Airport ==(JR/ Narita Express "N'EX")==> Shinjuku ( Time required: about 75min / Cost:3,110yen )
Note: The Narita Express separates at Tokyo Station. The front three(or six) cars go to Shinjuku.
Shinjuku ==(JR/ Chuo Line)==> Musashi-sakai ( about 23min / 290yen )
The timetable and other information are avaiable from JR N'EX webpage (http://www.jreast.co.jp/e/nex/index.html). Note that special rapid train does not stop at Musashi-sakai.

Route 4

Narita Airport ==(Keisei railway/ Skyliner)==> Ueno (56min / 1,920yen)
Note: About 5 minutes on foot from Keisei Ueno station to JR Ueno station.
Ueno ==(JR/ Yamanote line)==> Tokyo (6 min / 150yen)
Tokyo ==(JR/ Chuo line)==> Musashi-sakai (34min / 450yen)