Astronomy Mnemonics

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The first letter of each word gives you the first letter of the planets, in order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.

Matilda Visits Every Monday, Just Stays Until Noon, Period. My Very Easy Method—Just Set Up Nine Planets. My Very Educated Mother Just Served Us Nine Pizzas. Mary's Violet Eyes Make John Stay Up Nights Praying. My Very Energetic Mother Just Sat Upon (the) North Pole. My Very Educated Mother Just Sent Us Nine Pickles. My Very Educated Mother Just Served Us Nine Peas. My Very Excellent Memory Just Served Up Nine Planets.

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Galilean Satellites of Jupiter (Io, Europa, Ganymede, Callisto): I Eat Good Cake. I Expect God Cries.

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Saturnian Satellites (Mimas, Enceladus, Tethys, Dione, Rhea, Titan, Hyperion, Iapetus, Phoebe):


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Uranian Satellites (Miranda, Ariel, Umbriel, Titania, Oberon): MAUTO.

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Harvard Spectral Classification Scheme

The Traditional

Oh Be A Fine [Guy/Gal/Girl] Kiss Me (Right Now [Smack/Sweetheart]). Oh Begone, A Friend's Gonna Kiss Me (Right Now Smack). Only Boys Accepting Feminism Get Kissed Meaningfully. Political

Official Bureaucrats At Federal Government Kill Many Researchers' National Support

Only Big Astronomy Federal Grants Keep Money. Research Needs Support!

The Joys ofCollege

Oh Boy! Another Failing Grade Keeps Me Reconsidering Night School. Oh Bother, Astronomers Frequently Give Killer Midterms. Oh Bother, Another F's Gonna Kill Me.

Old Boring Astronomers Find Great Kicks Mustily Regaling Napping Students.

Obese Balding Astronomer Found Guilty Killing Many Reluctant Nonscience Students.

Appeals to Physics and Astronomy

Observationalists Basically Are Fine Generous Kind Men (Really Not Sexist)

Oh Backward Astronomer, Forget Geocentricity; Kepler's Motions Reveal Nature's Simplicity.

Organs Blaring and Fugues Galore, Kepler's Music Reads Nature's Score.

Out Beyond Andromeda, Fiery Gases Kindle Many Radiant New Stars.

Orbs, Bright And Fair, Generate Kinder Memories: Revolving Night-time Skies.

Only Bright Astral Fires Going Kaput Make Real Neutron Stars. For the old film buffs

Oven-Baked Ants, when Fried Gently, and Kept Moist, Retain Natural Succulence.


When Obstreperous Beasts Approach, Fragrant Geraniums Knowingly May Receive Night's Stigmata.

Old Bottles And Filthy Garbage Kill Many Rare Natural Species.

Oregon Beavers Attack Famous Gardens, Killing Many, Rangers Now Shooting.

One Bug Ate Five Green Killer Moths. OBAFGKMRNS

Star classes on a stellar evolution diagram ranging from hot, early type stars (O) to cool, late type stars (M) class. (Three additional classes (RNS) are no longer used.)

Oh, Be A Fine Girl, Kiss Me Right Now Sweetheart. Oh Be A Fine Girl Kiss Me Right Now Smack (the classic!). Oh Big And Ferocious Gorilla, Kill My Roommate Next Saturday. Oh Boy A F Grade Kills Me.

Only Bored Astronomers Find Gratification Knowing Mnemonics. Oh Bloody Astronomy! F Grades Kill Me.

Odd Ball Astronomers Find Generally Kooky Mnemonics Really Nifty Stuff.

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The order of the phases of the moon (and thus, whether the current appearance of the moon indicates waxing or waning) can be remembered with the phrase "What's up, DOC?": D indicates a (waxing) half-moon with the curve on the right, O indicates a full moon, and C indicates a (waning) crescent moon with the curve on the left, heading toward a new moon.

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To remember the constellations of the zodiac (Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces):

A Tense Gray Cat Lay Very Low, Sneaking Slowly, Contemplating A Pounce.

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