Sky & Telescope - January 2022 - 61

COLLECTION OF RAY HARRIS (2)
Fortunately, Messier was busy updating
his catalog, and in 1780 he extended
his original list from 45 objects to 68.
Four years later, he published his final
tally of 103 entries in the 1784 edition
of the French almanac Connaissance des
Temps. Since Messier himself verified
every object on his list, he mostly avoided
including false nebulae.
Early Star Atlases
How did star atlases of the 16th, 17th, and 18th centuries
generally deal with deep-sky objects? Mostly in ways that
wouldn't meet the needs of today's deep-sky observers. Here's
a brief survey of pre-telescopic atlases:
De le stelle fisse by Alessandro Piccolomini (1540). This was
the first star atlas ever printed and contains 47 small woodcut
charts (6.5 by 5.5 inches) depicting Ptolemy's constellations
BIG BEAR Giovanni Paolo Gallucci's atlas of
1588 was based on Ptolemy's 2nd-century Almagest.
Gallucci included all seven of Ptolemy's
" nebulae, " including one below the tail of Ursa
Major. The object is now charted as Coma Berenices
- a constellation in its own right.
(as described in the Almagest, which hails
back to the 2nd century), but it doesn't
display any deep-sky objects, it only shows
stars to 4th magnitude, and it lacks a
coordinate system. De le stelle fisse portrays the sky from a
" normal " perspective, that is, as seen from Earth's surface.
Theatrum Mundi by Giovanni Paolo Gallucci (1588). Consisting
of 48 small woodcut charts (6.5 by 5 inches) showing
Ptolemy's constellations, this atlas uses a coordinate grid
system based on the ecliptic (defined by Earth's orbital plane),
rather than the more familiar equatorial coordinate system
used on modern charts. Gallucci plotted Ptolemy's seven
DEEP-SKY BEGINNINGS Julius Schiller's celestial atlas, published in 1627, was the first to appear after the invention of the telescope. It depicts
the Pleiades with 10 stars on the chart-left shoulder of Saint Andrew the Apostle (who replaced Taurus in this atlas) but included only a few other
deep-sky objects. Note the chart's " mirror-reversed " perspective - as if the constellatons were viewed from outside the celestial sphere.
sk yand tele scope .o r g * JANUARY 2022 61
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Sky & Telescope - January 2022

Table of Contents for the Digital Edition of Sky & Telescope - January 2022

Contents
Sky & Telescope - January 2022 - Cover1
Sky & Telescope - January 2022 - Cover2
Sky & Telescope - January 2022 - 1
Sky & Telescope - January 2022 - Contents
Sky & Telescope - January 2022 - 3
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Sky & Telescope - January 2022 - Cover3
Sky & Telescope - January 2022 - Cover4
Sky & Telescope - January 2022 - SA1
Sky & Telescope - January 2022 - SA2
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