Columbia subject headings:
Cosmological distances--Measurement--Congresses.
Harvard subject headings:
Astrometry--Congresses
Cosmological distances--Measurement--Congresses.
Hipparcos (Artificial satellite)--Congresses.
Princeton subject headings:
Astrometry--Congresses.
Cosmological distances--Measurement--Congresses.
Hipparcos (Artificial satellite)--Congresses.