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Summary
Acting as the international latitude measurement service(ILS), this
international joint measurement of latitude was carried out from 1899
to 1978.

The ILS central station(Mizusawa) used the measured data, and expressed
the change of latitude at all the observatories by a uniform system.
This sytem is independent of the error in the positions of stars and the
error in instrument constants.

In this file, the coordinate values of polar motion(X, Y) have been
recorded with the unit of angular second.

Geographic Coverage Spatial coordinates   

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Temporal Coverage

Start Date: 1899-08-06 Stop Date: 1978-09-02

Location Keywords

GEOGRAPHIC REGION > GLOBAL

Science Keywords

SOLID EARTH > GEODETICS/GRAVITY > POLAR MOTION SOLID EARTH > GEODETICS/GRAVITY > ROTATIONAL VARIATIONS

ISO Topic Category

GEOSCIENTIFIC INFORMATION

Platform

FIXED OBSERVATION STATIONS

Instrument

TELESCOPES

Project

ILS > International Latitude Service

Ancillary Keywords

ILS POLAR MOTION VISUAL ZENITH TELESCOPE

Originating Center

NAOM

Data Center

National Astronomical Observatory, Japan Data Center URL: http://www.nao.ac.jp/ Dataset ID: VAREOP DATA Data Center Personnel Name: TOSHIAKI ISHIKAWA Phone: 81-197-22-7152 Contact Address: 2-12 Hoshigaoka-cho, Mizusawa-shi City: Iwate Postal Code: 023 Country: Japan

Personnel

TOSHIAKI ISHIKAWA Role: DIF AUTHOR Role: TECHNICAL CONTACT Phone: 81-197-22-7152 Contact Address: 2-12 Hoshigaoka-cho, Mizusawa-shi City: Iwate Postal Code: 023 Country: Japan KOICHI YOKOYAMA Role: INVESTIGATOR Phone: 81-197-22-7152 Contact Address: 2-12 Hoshigaoka-cho, Mizusawa-shi, Iwate 023 Country: JAPAN

Publications/References
Results of the International Latitude Service in a Homogeneous
System 1899-1980

Creation and Review Dates

Last DIF Revision Date: 1997-01-15

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