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75°
60°
45°
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-75°
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-75°
-60°
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Fig. 3.22 Distribution of IVS network stations throughout the world. Source: IVS
organization. It has therefore become a Euro-Asian VLBI Network. European
VLBI Network (EVN) provides observations on astrophysics and some astrometry
projects as well as international cooperation in the development of VLBI
techniques.
Asia-Pacific Telescope
This consists of VLBI organizations or observatories in the Asia-Pacific region and
organizes astronomical and geodynamic VLBI observations as well as academic
communications aperiodically every year.
Continuous Observation of the Rotation of Earth
This is a NASA project, managed by NASA's Goddard Space Flight Center
(GSFC). Most VLBI stations with the capacity to carry out astrometry or geodetic
surveying around the world have been involved in this project, whose scientific
purposes are to measure continuously the Earth's rotation parameters with high
precision and to provide highly precise data for the establishment and maintenance
of the celestial and terrestrial reference systems, as well as the observation of
modern plate movement.
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