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Recalculated Polar Motion Data on Homogeneous System of International Latitude Service

Entry ID: NAOMIZI-1

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Summary

Abstract: 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

(Click for Interactive Map)

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 > GRAVITY/GRAVITATIONAL FIELD > POLAR MOTION

SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > ROTATIONAL MOTION/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