{A determination of the solar parallax and mass of the moon, from heliometer observations of the minor planets Iris, Victoria an Sappho made in the years 1888 and 1889 at the Royal Observatory, Cape of Good Hope ...} Vol. 2

Contiene: Part 1: Description of the heliometers and details of the heliometer observations / prepared and edited by David Gill ; Part 2: Discussion of the places of comparison stars for Iris, Victoria, and Sappho, from meridian observations made at twenty-two observatories / by Arthur Auwers ; Part 3: On the construction of tables for the correction of heliometer measures for refraction / by Harold Jacoby