Sky & Telescope - January 2025 - 73

MAGNIFICENT AURORA
Your Complete Guide to
Nature's Greatest Light Show
by S&T Contributing Editor Bob King
pThe " ain't pretty " end of Cindy's scope,
showing the slightly off-center collimation bolts
and the truss attachment bolts, is still a work
of art.
than mount it on a board, she used slotted
angle brackets so she could scoot it
up and down, which gave her a lot more
leeway in placing the secondary mirror
and fine-tuning the focal point.
She settled on a two-truss system,
with bolts running into T-nuts in
wooden blocks that she glued inside the
ends of aluminum box tubing. When
the trusses are tightened up against
the cutting boards at top and bottom,
the structure is surprisingly stable. A
planned third truss proved unnecessary.
She used a metal ruler to make a curved
spider using Gary Seronik's design (S&T:
Apr. 2002, p. 108) . . . and suddenly she
had a scope. A scope built entirely with
simple tools.
Cindy was new at star testing. Stars
looked sharp, though, and the Moon
looked gorgeous through the uncoated
mirror. (There's something about bare
glass that makes the Moon seem almost
ethereal.) Then Cindy mentioned the
mirror to Mel Bartels, who had just
finished a computer program that
turns the Ronchi pattern into a null
test (bbastrodesigns/ronchi.html). He
tested Cindy's mirror and pronounced it
" excellent. "
Which is what I pronounce the
entire scope. Innovation abounds from
the salad bowl all the way up.
¢ Contributing Editor JERRY OLTION
appreciates fine art, especially when it's
in a telescope.
Find these and much more at skyandtelescope.org/community
sk yand tele scope .o r g * JANUARY 2025 73
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Sky & Telescope - January 2025

Table of Contents for the Digital Edition of Sky & Telescope - January 2025

Contents
Sky & Telescope - January 2025 - Cover1
Sky & Telescope - January 2025 - Cover2
Sky & Telescope - January 2025 - 1
Sky & Telescope - January 2025 - Contents
Sky & Telescope - January 2025 - 3
Sky & Telescope - January 2025 - 4
Sky & Telescope - January 2025 - 5
Sky & Telescope - January 2025 - 6
Sky & Telescope - January 2025 - 7
Sky & Telescope - January 2025 - 8
Sky & Telescope - January 2025 - 9
Sky & Telescope - January 2025 - 10
Sky & Telescope - January 2025 - 11
Sky & Telescope - January 2025 - 12
Sky & Telescope - January 2025 - 13
Sky & Telescope - January 2025 - 14
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Sky & Telescope - January 2025 - 17
Sky & Telescope - January 2025 - 18
Sky & Telescope - January 2025 - 19
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Sky & Telescope - January 2025 - 24
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Sky & Telescope - January 2025 - 26
Sky & Telescope - January 2025 - 27
Sky & Telescope - January 2025 - 28
Sky & Telescope - January 2025 - 29
Sky & Telescope - January 2025 - 30
Sky & Telescope - January 2025 - 31
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Sky & Telescope - January 2025 - 33
Sky & Telescope - January 2025 - 34
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Sky & Telescope - January 2025 - 37
Sky & Telescope - January 2025 - 38
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Sky & Telescope - January 2025 - 40
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Sky & Telescope - January 2025 - 46
Sky & Telescope - January 2025 - 47
Sky & Telescope - January 2025 - 48
Sky & Telescope - January 2025 - 49
Sky & Telescope - January 2025 - 50
Sky & Telescope - January 2025 - 51
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Sky & Telescope - January 2025 - 60
Sky & Telescope - January 2025 - 61
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Sky & Telescope - January 2025 - 63
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Sky & Telescope - January 2025 - 65
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Sky & Telescope - January 2025 - 72
Sky & Telescope - January 2025 - 73
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Sky & Telescope - January 2025 - Cover3
Sky & Telescope - January 2025 - Cover4
Sky & Telescope - January 2025 - SGA1
Sky & Telescope - January 2025 - SGA2
Sky & Telescope - January 2025 - SGA3
Sky & Telescope - January 2025 - SGA4
Sky & Telescope - January 2025 - SGA5
Sky & Telescope - January 2025 - SGA6
Sky & Telescope - January 2025 - SGA7
Sky & Telescope - January 2025 - SGA8
Sky & Telescope - January 2025 - SGA9
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