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The Field Library

A free, growing collection of printable astronomy guides — observing lists, catalog references, imaging recipes, and quick-print sky maps. Built for the dark site, the binoculars on the porch, and the quiet hour before clear skies.

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27
Free Guides
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294
Total Pages
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300+
Curated Targets
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$0
Always Free
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How to use these: tap any card to preview the PDF in your browser, then save or print from there. All guides are formatted for A4 and US Letter at standard margins. Free to share with credit. If you spot an error or have a suggestion, the feedback button on the home page goes straight to me.
Search:
No guides match. Try a shorter term, a catalog name (Messier, Caldwell), or a topic (moon, meteor, bortle).
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Getting Started
Brand new to astronomy? Start here. The foundational decisions and first nights every amateur faces — what to buy, how to mount it, the first time you point it up, how to see well through it, and when to try imaging.
5 Guides
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Telescope Buying Guide
Your first scope decided in plain English — refractor vs reflector vs catadioptric, aperture math, mount types, what to skip, what to spend on. Decision tree by budget and what you actually want to look at.
Read online · printable PDF inside →
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Mount Selection Guide
The unglamorous part of the kit that decides whether anything else works — alt-azimuth vs equatorial vs Dobsonian, payload capacity, tracking accuracy, when to upgrade and when to wait. A bad mount ruins a good scope.
PDF · 42 KB · 11 pages →
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First Night with Your Telescope
The box is open — now what? Setup checklist, first-light targets, focusing tips, what to expect (and what not to), and the common rookie mistakes that turn a magical night into a frustrating one. Read this before the box even arrives.
Read online · printable PDF inside →
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Eyepiece Selection Guide
Focal length, apparent field of view, eye relief, barrel size — the four numbers that determine what you actually see. Building a sensible 3–4 eyepiece kit without buying the same magnification twice.
PDF · 48 KB · 10 pages →
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Astrophotography Starter Guide
The first rung of the imaging ladder — DSLR or dedicated camera, tripod or tracker, what to image first, exposure basics, stacking introduction. The realistic version, not the gear-influencer version.
Read online · printable PDF inside →
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Deep Sky Catalogs
Charles Messier's 110 + Patrick Moore's 109 — the two essential lifetime observing lists
2 Guides
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Messier Field Guide — Seasonal
All 110 Messier objects organized by season, with visual notes, imaging notes, sizes, magnitudes, RA/Dec, and difficulty for every entry. The complete reference for the catalog every amateur grows up with.
PDF · 65 KB · 18 pages →
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Caldwell Field Guide
Patrick Moore's deep-sky complement to Messier — 38 of the best-observed Caldwell objects (Helix, Double Cluster, Veil, Iris, Sculptor, Cat's Eye) visible from 45° N, organized seasonally.
PDF · 46 KB · 10 pages →
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Observing Lists & Checklists
Take these to the eyepiece — tick boxes, log finds, run marathons
2 Guides
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Messier Marathon Checklist
All 110 Messier objects in canonical observing order — sundown to sunrise on a late-March moonless night. Checkbox column for tracking finds, session sheet for date / location / equipment.
PDF · 26 KB · 6 pages →
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Doubles & Variables Visual Guide
31 famous double stars + 22 variable stars — the targets that don't care about light pollution. Color contrasts (Albireo, Almach), tightness challenges (Porrima, Castor), and the imminent T CrB nova.
PDF · 43 KB · 10 pages →
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Astrophotography Guides
Imaging recipes — from automated smart telescopes through wide-field nightscapes to deep-sky narrowband, ending at post-processing mastery
5 Guides
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Smart Telescope & EAA Guide
The fastest path from "I bought a scope" to "look what I captured" — Vespera, eVscope, Seestar, Dwarf and the Electronically Assisted Astronomy approach. What they do well, what they don't, and how they fit alongside traditional observing.
PDF · 43 KB · 12 pages →
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Milky Way Nightscape Photography
Wide-field landscape astrophotography from one-shot DSLR/mirrorless cameras — best season and time, planning by moon phase and core position, exposure settings, foreground composition, post-processing for the galactic core.
PDF · 216 KB · 19 pages →
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Bright Nebulae Imaging Guide
Emission and reflection nebulae for narrowband and broadband imaging — Sharpless catalog highlights, recommended focal lengths, SHO/HOO/RGB strategies, integration time guidance per target.
PDF · 49 KB · 10 pages →
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Dark Nebulae Imaging Guide
Barnard objects, LDN catalog, the Pipe, the Coalsack, the Snake — dark nebulae that hide in star fields and reward long broadband integration time. Composition tips for finding shape in nothingness.
PDF · 48 KB · 9 pages →
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Image Processing Deep Dive
You captured the data — now what? Calibration, stacking, gradient removal, stretching, star reduction, colour calibration, sharpening, noise reduction. The end-to-end workflow that turns 200 raw subs into a finished image.
PDF · 61 KB · 19 pages →
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Solar System & Sky Phenomena
The Sun, the Moon, the planets, comets, meteors, aurora, and the satellites overhead — everything inside our cosmic neighborhood, our own atmosphere, and low Earth orbit
7 Guides
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Solar Observing Guide
Daytime astronomy done safely — ISO 12312-2 essentials, what you see in white light vs H-alpha, equipment from eclipse glasses to Lunt scopes, current solar cycle context, upcoming eclipse calendar.
PDF · 97 KB · 10 pages →
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Moon Map & Guide
Labeled lunar map with the maria, major craters, and mountain ranges, plus an observing guide tied to lunar phases — what to see at first quarter, full moon, last quarter, and along the terminator.
PDF · 93 KB · 7 pages →
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Planet Observing Guide
The eight planets through amateur eyes — what you can actually see, when each is best, telescope and magnification recommendations, surface features and moons worth hunting. Mercury through Neptune with seasonal visibility notes.
PDF · 68 KB · 12 pages →
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Comet Observing Guide
Hunting periodic and long-period comets — what to expect from coma vs tail, how predicted magnitudes lie, finder charts and ephemeris basics, binocular vs telescope tradeoffs, and how to follow a comet across the sky over weeks.
PDF · 55 KB · 7 pages →
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Aurora Observing Guide
Chasing the northern (and southern) lights — Kp index basics, geomagnetic latitude, the colors-by-altitude science, where to look on the horizon, simple photography tips, and the solar-cycle context driving current activity.
Read online · printable PDF inside →
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Meteor Shower Calendar
Major showers month-by-month — peak dates, expected ZHR, radiant constellation, parent comet, and viewing notes. Print one page, keep it on the fridge for the year.
PDF · 26 KB · 3 pages →
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ISS & Satellite Guide
Watching the artificial sky — predicting ISS passes, brightness expectations, Starlink trains, Iridium flares (now mostly history), how to spot a satellite without an app, and the difference between an actual satellite and a high-altitude plane.
PDF · 34 KB · 8 pages →
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Reference & Charts
Year-spanning almanac, monthly sky maps, target finder charts, dark-sky reference, and the long view of how we got here — the bag, the binder, the wall
6 Guides
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Annual Astronomical Events Almanac
The year at a glance — eclipses, planetary conjunctions, oppositions, meteor shower peaks, supermoons, equinoxes, solstices. Month-by-month list so you can mark the calendar in January and not miss anything in October.
PDF · 37 KB · 9 pages →
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Monthly Star Maps · 45° N
12 all-sky charts (one per month) for 45° N latitude at 9 PM local time on the 15th. Featured Messier highlights labeled in gold. Print just the page you need for the night.
PDF · 416 KB · 13 pages →
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Star Hop Finder Charts
Step-by-step finder paths for popular deep-sky targets from naked-eye landmarks. Star hopping is the manual GoTo — slower, more rewarding, and the skill that makes you actually know the sky instead of just clicking buttons.
PDF · 155 KB · 10 pages →
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Bortle Scale Reference
The nine-class dark-sky scale, with naked-eye limiting magnitude, what's visible at each class, and how to estimate your home and dark-site classes without a sky-quality meter.
Read online · printable PDF inside →
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Astronomy Weather Guide
How to read sky forecasts like an observer — seeing vs transparency, jet-stream effects, high cirrus vs low cumulus, humidity and dew, and the difference between weather that ruins astronomy and weather that's just inconvenient.
PDF · 49 KB · 14 pages →
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History of Astronomy
From naked-eye antiquity to the space-telescope era — the people, instruments, and turning-point observations that built modern astronomy. The long view, for when you want to know whose shoulders you're standing on under the dark sky.
PDF · 92 KB · 23 pages →
More guides coming
This library grows when there's a gap worth filling. If there's a guide you'd love to see — a specific catalog, a technique, a checklist — tell me. The feedback button on the home page goes straight to my inbox.
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