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
 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    [Definition]
SOLID EARTH >GRAVITY/GRAVITATIONAL FIELD >ROTATIONAL MOTION/VARIATIONS    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Platform
FIXED OBSERVATION STATIONS    [Information]


Instrument
TELESCOPES    [Information]


Project
ILS >International Latitude Service    [Information]


Keywords
ILS
POLAR MOTION
VISUAL ZENITH TELESCOPE


Originating Center
NAOM


Data Center
National Astronomical Observatory, Japan    [Information]
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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