"When the moon is in the seventh house
And Jupiter aligns with Mars
Then peace will guide the planets
And love will steer the stars"
, "Age of Aquarius"
Something in the plot depends on some stars or planets lining up in a particular order at a certain time (an event known in astronomy as syzygy). Often doomsayers claim this will be the cause for The End of the World as We Know It
, whether by breaking the tectonic plates, causing a shift of the poles, changing the Earth's rotation..., or introducing the Eldritch Abomination
When it overlaps with Significant Birth Date
, it can occur in the Back Story
and still complicate the plot; this can produce The Chosen One
or the Big Bad
- A Year and a Day, where the countdown is not to some specified event but is tied to the passage of a fixed length of time.
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Anime and Manga
- Saint Seiya: During the Hades arc in which the 9 planets (remenber, back then Pluto was still consider a planet) will all align together and cause the Greatest Eclipse.
- In Highlander: The Source, the entire galaxy—every single celestial body from moons to planets to stars, and all of them in the solar system—comes into alignment, all focused on Earth. Even non-scientists and children knew better, but that didn't stop the writers.
- Teenage Mutant Ninja Turtles (2007): the portal opens when stars line up.
- Hercules: the Titans can only be freed when the planets line up.
- Notably, it is only the further six planets (well, five planets and Pluto, but it was considered a main planet back then) which apply, as their alignment basically reveals the location of the Titans' prison and unlocks it, enabling Hades to free them.
- The Final Conflict. The alignment of three stars creates the second Star of Bethlehem, a sign of the Second Coming of Christ.
- Tomb Raider. A magic item that can be used to control time can only be accessed during a planetary alignment that occurs once every 5,000 years.
- The Dark Crystal involves a triple-sun alignment called the Great Conjunction.
- 2012 vaguely waves at this, with the Critical Research Failure of another planet visible from Earth's orbit and Jupiter visible from Saturn, but apart from Woody Harrelson's free-associating conspiracy theorist, it doesn't come up again.
- In The Scorpion King, the villain will allegedly become invincible when the Moon is in "the House of Scorpio".
- The Mac Gyver Lost Treasure Of Atlantis TV-movie features this. For some reason, the planets are visible, to the point where they would actually collide with each other.
- Pee-wee's Big Adventure - after his bike was stolen, Pee-wee has all his friends assemble in his basement as he manically pieces together clues to the crime - including planetary alignment.
- A major plot point of Thor: The Dark World is the Convergence, an alignment of the Nine Realms that only happens once ever 5000 years, causing portals between the worlds to open at random. Malekith intends to use the Convergence to spread the Aether across the universe, destroying everything.
- Part of the All There in the Manual explanation for Elsa's powers in Frozen is this. According to Word of God, 1,000 years after Saturn is in a certain alignment, a child is born with ice magic. This was going to be explained in the film itself but was cut for not being important to the focus of the film.
- 5/5/2000, ICE: The Ultimate Disaster claimed that on the title date a planetary alignment would cause catastrophic disaster on Earth.
- Robert A. Heinlein's Farmer in the Sky featured a dramatic alignment of the moons of Jupiter which the protagonists watched from Ganymede.
- In Kushiel's Mercy, the Carthaginians take advantage of an astrological event to put a spell on the entire city.
- One of the stories in Star Trek: The Brave and the Bold involves a Bajoran prophecy suggesting Bajor will be at peace when all the planet’s moons fully align. The bitter old terrorist Orta seeks to use a powerful artifact he’s unearthed (created by Sealed Evil in a Can Malkus) to artificially move a moon and fulfil the prophecy early. Of course, he doesn’t actually want peace - he’s just using the prophecy as a ploy to start a conflict with the Federation.
- In the Cthulhu Mythos universe by HP Lovecraft and others, there are many references to how the Great Old Ones will return "when the stars are right".
- Though it's never explicitly said what that entails. In fact an alternate interpretation at least in Cthulu's case is that it refers to the Elder-Things (who may or may not have been responsible for trapping Cthulu underwater to begin with) which are described as having star-like heads.
- One of the lesser Dragonlance novels featured a portentious lunar alignment between the white, red, and black moons of Krynn, known as the "Night of the Eye".
- In John Brunner's The Traveller in Black series, the Traveller makes his periodic journeys when a certain array of four planets comes into alignment.
- Two alignments of the seven planets play a major role in the timing of the third book of the Septimus Heap series.
Live Action TV
- The X-Files episode "Syzygy". An alignment of Mercury, Mars and Uranus may have something to do with several murder cases in a small town.
- Astronomer Sir Patrick Moore appeared on Have I Got News for You at a time when an impending alignment of the planets was being hyped in the tabloids as a catastrophe. Angus Deayton gave him pieces of fruit to represent the planets and kept referring back to the rumors, even though what Moore was demonstrating with the fruit was that absolutely nothing was going to happen.
Angus Deayton: This is the prediction that Jupiter and Saturn will align with Mars, Venus, and Mercury in the year 2000, which will cause flooding, earthquakes and tidal waves. The planetary alignment will cause gravitation forces from the Sun to...
Paul Merton: No, it won't! Patrick says it won't!
Ian Hislop: There isn't a lot of point getting an astronomer on if you're just going to read out a load of balls!
Paul Merton: Ian, the correct term is spheres.
- On another occasion, Sir Patrick announced on radio that a rare alignment of the planets would temporarily reduce the Earth's gravitational pull, as people could discover by jumping up and down. Several listeners called in to confirm this, one man claiming that he had bumped his head on his ceiling. The fact that the broadcast went out on April Fool's Day seemed to have escaped their notice.
- The first half of Rescue Sentai GoGoFive had the Saima preparing for the planets to line up into the Grand Cross so they can bring back Grandienne. This carried over to their American counterparts in Power Rangers Lightspeed Rescue. Like with Dengeki Sentai Changeman and Halley's Comet, in August 1999, the Grand Cross occurred as well.
- In episode two of Tensou Sentai Goseiger, Hyde is told the Gosei Angels can only return to their own world during a solar flare that occurs once every 200 years. Unfortunately, at that time they are fighting a Monster of the Week, and he decides to remain on earth instead to protect the earth with the others.
- In the Doctor Who serial "The Masque Of Mandragora", Hieronymous invokes this. He even appears to believe it.
- The series four finale ("The Stolen Earth"/"Journey's End") had twenty-seven planets stolen from their home systems and placed in perfect alignment by the Daleks to create an engine to be used to amplify the "reality bomb" that would destroy every universe in all of reality.
- Star Fleet has all the planets in Earth's solar system aligning at the end of the year 2999 for the dawn of a new millenium.
- The Sarah Jane Adventures took this trope Up to Eleven with the Ancient Lights. Their master plan relied on every star in the universe entering into a very specific pattern.
- The Tin Man mini-series has the Big Bad plan to use a Magitek machine to "freeze" the Outer Zone's two suns in a permanent position behind the moon, thus placing the OZ in perpetual darkness.
- Land of the Lost (1991) had an episode where the animals were going mad due to the world's three moons aligning.
Religion and Mythology
- It has been suggested that the star which guided the Wise Men to Jesus' manger was not actually a star, but a particular astronomical alignment.
- Dungeons & Dragons
- Adventure "Sign of the Times" in generic AD&D2 supplement Treasure Maps. Every 700 years during a specific astrological conjunction of planets, moons and stars the king of a desert empire will fall ill and die, and his son will take his place. The new king will become evil and cruel, raising taxes and invading other countries. Natural disasters (famine, pestilence and drought) will ravage the land.
- Al-Qadim setting, in The Complete Sha'ir's Handbook, has a Wizard kit "Astrologer", with a shade of Mad Scientist, who have to play with an orrery and may have up to 3 bonus spells discharged at will, but conditioned on visibility of one of 12 constellation.
- Violet Dawn setting has feat "Secrets 0f the Stars" in one tradition. It allows to predict a "propitious time" for some or other activity involving XP cost (i.e. item enchantment or casting powerful spells), sticking to which halves said cost.
- In Rifts, The Great Cataclysm occurring during (and in part because of) a rare conjunction of the planets. It caused the Ley Lines to surge with power. This combined with a couple other factors upset the Earth's magical balance, causing The Coming of the Rifts.
- In Yu-Gi-Oh!, this is referenced in two cards, Grand Convergence and the anime-exclusive Planet Alignment. The former destroys all monsters on the field, the latter just your opponent's, but both feature planetary alignments in their card art.
- Hair references the trope during the "Age of Aquarius" song: "When the moon is in the seventh house and Jupiter aligns with Mars/then peace will guide the planets and love will steer the stars"
- Voyager 2's trajectory took it past Jupiter, Saturn, Uranus and Neptune, due to a planetary alignment that only occurs once every two or three centuries.
- The Jupiter Effect was a 1974 book that predicted that a planetary alignment on March 10, 1982 would have disastrous effects on Earth. (It didn't.)
- On roughly December 21 every year, Earth, the Sun, and the galactic center line up (almost: the galactic centre (Sagittarius A*) is seven degrees away from the ecliptic). Some people, not realizing it happens every year, predict this will have dire consequences in a specific year.
- The small asteroid Apophis will approach Earth in 2029. If it passed through a "keyhole" (a certain set of trajectories) it would hit Earth in 2036. (Later observations showed it won't.)
- The "Jovian-Plutonian Gravitational Effect" hoax of 1976 by the British astronomer Patrick Moore. The guy stated to radio listeners that an alignment of Jupiter and Pluto on 9.40 am, April 1, 1976, will noticeably reduce gravity on Earth. Many believed.
- The phrase "when the stars are right," along with its variants, is sometimes used to refer to necessary conditions which are difficult to arrange or cannot be readily determined, especially referring to computer use or programming.