  The number of spots on the surface of the Sun is one of the best tracers of
solar variability we have. The sunspot number is not only known to change in
phase with the 11-year solar cycles, but also to show variability on longer
time scales. It is, however, not only the sunspot number that changes in
connection with solar variability. The location of the spots on the solar
surface is also known to change in phase with the 11-year solar cycle. This has
traditionally been visualised in the so-called butterfly diagram, but this is
only well constrained from the beginning of the 19th century. This is
unfortunate, as knowledge about the butterfly diagram could aid our
understanding of the variability and the Sun-Earth connection. As part of a
larger review of the work done on sunspots by the Danish astronomer Christian
Horrebow, we here present a reanalysis of Christian Horrebow's notebooks
covering the years 1761 and 1764 - 1777. These notebooks have been analysed in
at least three earlier studies by Thiele (Astron. Nachr. 50, 257, 1859),
d'Arrest (published in Wolf, Astron. Mitt. Eidgenoss. Sternwarte Zur. 4, 77,
1873) and Hoyt and Schatten (Solar Phys. 160, 387, 1995). In this article, we
construct a complete record of sunspot positions covering the years 1761 and
1764 - 1777. The resulting butterfly diagram shows the characteristic structure
known from observations in the 19th and 20th century. We do see some
indications of equatorial sunspots in the observations we have from Cycle 1.
However, in Cycle 2, which has much better coverage, we do not see such
indications.
