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Type a sign, a constellation or the myth behind it. ShortFast writes the script, builds a scene for every line in a painted, watercolor, anime or science-explainer look, narrates it and adds captions.
To make a zodiac video with AI, type the sign, the constellation or the myth into the box above, pick a look, and ShortFast writes the script, builds a scene for each line, narrates it and burns in captions. In the default Classical Painting look, or another still-image style such as Watercolor, Anime or Flat Vector, a video typically costs about 25 credits. The box sets the video up; generating it needs a ShortFast account, which starts with a 3-day trial for $1.
Zodiac videos work from three honest angles: the Greek myth behind a sign, the real constellations in the sky, and sign videos made for fun. Each goes wrong in its own way: a myth in a version no ancient writer told, a sign's dates passed off as where the Sun really is, a prediction presented as fact. So the steps below keep each video to one angle and check it before anything is rendered.
How it works
A myth ('how the Nemean lion became Leo'), a piece of sky ('why the Sun crosses a 13th constellation') or one sign told for fun. 'Everything about Scorpio' mixes all three, and the facts and the fun blur together.
Classical Painting for the Greek myths, Flat Vector for the astronomy, Watercolor or Anime for sign videos made for fun, Retro Poster for one bold sign per video, Cinematic for night-sky mood.
Paste your own script or edit the draft. Check the myth against a classical source such as Theoi.com and say whose version it is; check the astronomy against NASA or the International Astronomical Union. In script mode ShortFast narrates your words as written, and the narration can't be changed after the render.
AI star maps are illustrations, not charts: the stars in a scene won't sit where the real ones do. Swap any scene a viewer could take for a real chart for another image or one you upload, adjust captions, music, title and post text, then re-render.
Download the video, or connect TikTok, Instagram and YouTube. An automation writes the next episode for each posting slot: a new myth, sign or piece of sky in the same tone, format and length, with recent titles checked so it doesn't repeat.
Classical Painting, the default here, turns every line into an old-master oil painting, the natural look for the Greek myths behind the signs: Heracles and the lion, Orion and the scorpion, Asclepius holding the serpent. Nobody mistakes a painting for a photograph, so the myth reads as myth. A video in it typically costs about 25 credits.
Flat Vector is the astronomy look: clean shapes in the manner of a science explainer, built for science, space and how things work. It shows what a camera can't: the Sun's yearly path through the constellations, Earth's axis wobbling like a top, the 13th constellation on that path. It is plainly an illustration, not a photograph. About 25 credits.
For sign videos made for fun, Watercolor gives soft storybook washes for calm, gentle ones, and Anime tells a sign as a character in a short story, under cel-shaded, painted skies. Retro Poster renders each scene as a mid-century screen print, which suits one sign per video around one bold symbol: the lion, the scales, the scorpion. Each typically costs about 25 credits.
Cinematic gives photoreal film stills: a stargazer on a hill, a desert sky full of stars. It is the mood option, and the one that looks like photography, so if a Cinematic scene could pass for a real photograph of a real place, event or sky, answer Yes to YouTube's AI question (see below). Also about 25 credits.
Every look above can also turn each image into a short AI video clip. That raises a typical video to about 464 credits, so keep it for a series' strongest episodes rather than the daily post.
"Leo and the Nemean lion: Heracles' first labour was to kill a lion no weapon could wound. His arrows failed, so he blocked one mouth of its two-mouthed cave, went in by the other and choked it with his bare hands, then wore its skin. In one version Hera set the lion among the stars as Leo. Classical Painting look, storyteller narrator, end on the lion in the night sky."
"Why the Sun crosses 13 zodiac constellations, not 12: the Babylonians left out Ophiuchus, the serpent holder, to fit a 12-month calendar. Then precession: Earth's axis wobbles like a top, one circle in about 26,000 years, so the Sun's spring-equinox spot moved from Aries into Pisces around the year 1. Flat Vector look, friendly science narrator, end on why sign dates and stars no longer match."
"Scorpio, just for fun: say so in the first line. Play the traits astrology gives Scorpio as a short anime story, then the myth behind the sign: Gaia sent a giant scorpion against the hunter Orion, and the two were set in the sky so that as the Scorpion rises, Orion sets. Show Antares, the red star called the heart of the scorpion. Anime look, playful narrator, end by asking Scorpios if it fits."
Each fits the 400-character limit of the box above. Write the version of the myth and the astronomy into the prompt yourself, as here, rather than asking for 'facts about Leo': then you know what the narrator will say and can name your source in the post text.
Myths come in versions, so say whose you're telling. Theoi.com, which collects the classical texts, sums up that Hera placed the Nemean lion among the stars as Leo; the Roman mythographer Hyginus says only that it was put there as the king of beasts, and that some writers add Heracles killed it unarmed. For Scorpius, Hyginus says the Earth sent the scorpion after Orion boasted he could kill anything the earth produced, and that the constellations were set so that 'when Scorpion rises, Orion sets'. He also explains a link many viewers miss: the scorpion's claws spread so wide that one part of the sign came to be called the Balance, Libra. Name your source in the post text.
The astronomy is simpler than the internet makes it. The International Astronomical Union (IAU) says the zodiac constellations are defined by the Sun's apparent path against the stars and were devised by the ancient Babylonians, who saw the Sun move through 13 constellations and left one, Ophiuchus, out to fit their 12-month lunar calendar. Their 12 were evenly spaced; real constellations have different shapes and sizes, so the Sun spends different amounts of time in each. Ophiuchus isn't a new sign anyone discovered: in the IAU's words, it 'is one of the constellations of the zodiac, and has been for quite some time'.
Then there's precession. Earth's axis wobbles like a spinning top, one full circle in about 26,000 years, according to NASA, and that slowly moves the point where the Sun stands at the spring equinox. In ancient times it was in Aries, which is why it is still sometimes called the first point of Aries; around the year 1 it moved into Pisces. Between the uneven constellations and that drift, the dates printed next to each sign no longer match the constellation the Sun is actually in.
Sign videos are where honesty matters most. Astrology isn't a science, and NASA says so plainly: it is 'important to some cultural traditions', but 'its claims are not based on scientific evidence'. That doesn't stop a sign video from being fun. Say it's for fun in the first line or the post text, keep any prediction playful, and leave out health, money and relationship advice that someone might act on.
YouTube asks you to disclose AI content that looks realistic and shows a real person doing or saying something they didn't, alters footage of a real event or place, or generates a realistic scene that didn't happen. You answer Yes under 'AI use' when you upload; for videos ShortFast posts for you, the setting is in YouTube Studio. YouTube's own examples of content that needs no disclosure include clearly unrealistic content, animation, and using AI to write the script or the captions, and it says disclosing alone won't limit a video's audience or its eligibility to earn money. A painted myth, a watercolor sign or a flat-vector diagram of the Sun's path is plainly not a photograph. A photoreal Cinematic scene of a real place, or of something that never happened, is the case the disclosure exists for: answer Yes.
TikTok requires a label on AI-generated content that contains realistic images, audio or video. Artistic styles such as anime, and generic text-to-speech narration that isn't the recognisable voice of a known person, don't need one, but TikTok encourages labeling anything completely generated or significantly edited by AI and says the setting won't affect distribution, so turning it on costs nothing. Even with a label, TikTok doesn't allow AI content that shows fake authoritative sources or falsely shows a public figure making an endorsement: no AI 'announcement' from NASA or an observatory that the signs have changed, and no famous face recommending a reading.
Neither platform's scam rules mention readings or fortune-telling by name. TikTok's Community Guidelines don't allow 'any attempts to scam, trick or defraud people', including financial scams such as 'get-rich-quick' schemes and impersonating a celebrity to sell something. YouTube's spam policy lists 'get rich quick' investment schemes among the scams it doesn't allow. And YouTube won't monetise channels whose AI personas present as human experts giving advice on health, legal issues, finances or politics, so keep the narrator a narrator, not an AI 'astrologer' handing out money or health advice.
The rule a zodiac channel is most likely to meet is about repetition, and daily sign templates are the classic case: twelve videos a day, the same script with the sign's name swapped, regenerated with minimal change. YouTube's monetisation policies say generic or repetitive content 'includes content that looks like it's made with a template, or that may feel repetitive to viewers after watching several videos in a row from the same channel', and that 'channels where content feels interchangeable from video to video are not allowed to monetize'. Its spam policy goes further: posting a few variations of a video is fine, but 'using automated tools or AI to churn out high volumes of similar content with minimal changes' is not, and its example is a channel using 'the exact same background music and repetitive AI generated imagery across many videos, with each video reading out an AI-generated script'. What YouTube asks is that 'the substance of each video should be materially varied and deliver creative, educational, or other value': a new myth, a new piece of sky, a sign seen from a new side.
It doesn't check myths or astronomy. ShortFast writes a fluent script, and fluent isn't the same as right: a draft can blend two versions of a myth, or give a sign's dates as if the Sun were really in that constellation. Check every claim before you render.
AI star maps are illustrative, not accurate charts. The image model draws a believable sky, not the real one, so the stars, shapes and positions in a scene won't match what's overhead. Keep the facts in the narration, and if a video needs a real chart, upload one you have the right to use. It doesn't animate maps or charts either.
The narration is fixed once rendered. You can swap scenes, edit captions and re-render, but changing what the narrator says means generating again.
An automation has no approval step. Each episode posts automatically or arrives by email, so for a sign series, choose email and read each one before it goes out. The next two episodes are queued ahead: you can edit their captions, scenes and post text, re-time, pin or delete one, but not change its script.
None of these channels use ShortFast; they show what zodiac and mythology audiences reward. See U in History / Mythology gives every sign a video of its own in an illustrated, comic-style series, with titles such as 'Leo Zodiac Sign - The Mythological Origin of the Zodiac Signs', and tells Heracles' fight in 'Hercules and the Nemean Lion'. Overly Sarcastic Productions retells myths in drawn cartoons with comic narration, including 'Miscellaneous Myths: The Zodiac' and 'Miscellaneous Myths: Orion'. Dr. Becky, an astrophysicist, explains astronomy to camera, and her 'Astrophysicist Debunks Horoscopes with Basic Astronomy' is the sky angle in one title.
What they share is one story or one piece of sky per video, told by a narrator with a point of view. That is the part to copy; the visuals are the part ShortFast handles.
FAQ
Keep going
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OpenShortFast writes the script, generates the video, adds captions, and posts it to TikTok, Reels, and YouTube Shorts for you, every day.
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