Blue Moon or an extra full moon in the season or an extra moon within a calendar month was once called the betrayer or liar’s moon. At one time priests decided to use the extra moon, the thirteenth moon to relate the story of Judas the betrayer, the thirteenth follower of Jesus.
Since the medieval time, superstitions have come and gone to explain the moon and it's effects on the tides and people's hearts.
- Superstitions about blue moons include an old farmer belief that the full moon pulls the plants up from the ground. The extra full moon symbolizes the promise of a bumper crop on the way.
- Underground vegetables such as carrots or potatoes grow better if they’re planted by the moon.
- For the romantic, the full moon is as good as a green light to take your relationship to the next level. Many a young woman hoped to receive long stem roses and a ring by the light of the full moon.
- For the sick, the full moon represented a time for curing illness. As doctor’s know now, if a patient believes something is a good omen or the sign of healing, the belief often works it’s placebo effect and the patient does exhibit improvement.
Poets often write about the moon as did JRR Tolkien in the following: 
The Man in the Moon Came Down Too Soon
beneath an old grey hill,
And there they brew a beer so brown
That the Man in the Moon himself came down
one night to drink his fill.
The ostler has a tipsy cat
that plays a five-stringed fiddle;
And up and down he saws his bow
Now squeaking high, now purring low,
now sawing in the middle.
The landlord keeps a little dog
that is mighty fond of jokes;
When there's good cheer among the guests,
He cocks an ear at all the jests
and laughs until he chokes.
They also keep a hornéd cow
as proud as any queen;
But music turns her head like ale,
And makes her wave her tufted tail
and dance upon the green.
And O! the rows of silver dishes
and the store of silver spoons!
For Sunday there's a special pair,
And these they polish up with care
on Saturday afternoons.
The Man in the Moon was drinking deep,
and the cat began to wail;
A dish and a spoon on the table danced,
The cow in the garden madly pranced
and the little dog chased his tail.
The Man in the Moon took another mug,
and then rolled beneath his chair;
And there he dozed and dreamed of ale,
Till in the sky the stars were pale,
and dawn was in the air.
Then the ostler said to his tipsy cat:
'The white horses of the Moon,
They neigh and champ their silver bits;
But their master's been and drowned his wits,
and the Sun'll be rising soon!'
So the cat on the fiddle played hey-diddle-diddle,
a jig that would wake the dead:
He squeaked and sawed and quickened the tune,
While the landlord shook the Man in the Moon:
'It's after three!' he said.
They rolled the Man slowly up the hill
and bundled him into the Moon,
While his horses galloped up in rear,
And the cow came capering like a deer,
and a dish ran up with the spoon.
Now quicker the fiddle went deedle-dum-diddle;
the dog began to roar,
The cow and the horses stood on their heads;
The guests all bounded from their beds
and danced upon the floor.
With a ping and a pang the fiddle-strings broke!
the cow jumped over the Moon,
And the little dog laughed to see such fun,
And the Saturday dish went off at a run
with the silver Sunday spoon.
The round Moon rolled behind the hill,
as the Sun raised up her head.
She* hardly believed her fiery eyes;
For though it was day, to her surprise
they all went back to bed!
The next blue moon will arrive August 21, 2013.
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