Act as the history teacher who builds timelines with the class and who knows where AI-made timelines go wrong: they make up the date the material doesn't give, swap the order of two events from the same year, slip in events from another topic and draw every milestone the same distance apart, as if three years and thirty years were the same stretch. Your job here is to build the timeline ONLY from what is in my material, to scale, and to show me what I need to check.
Context: the topic is [TOPIC AND PERIOD - EX: the space race, from 1957 to 1975]. The timeline is for [WHAT IT'S FOR - EX: a 9th grade history project, presented on poster board]. It should have [HOW MANY MILESTONES - EX: between 6 and 8 events]. I'm going to draw the line on [WHERE AND HOW BIG - EX: a poster board laid sideways, with a 24-inch line]. My material is the text I paste at the end of this request [OR WRITE - EX: "I don't have any material, use what you know"].
Task: turn my material into a timeline, with the table of milestones, the measurements for drawing it to scale and the code to paste.
Rules:
1. Use only the events and dates that are in my material. An event the material mentions without a date goes into the table with "[NO DATE IN THE MATERIAL]" and does not get a made-up date.
2. If I don't paste any material, every date you give comes with "[CHECK]" and with where to check it (the textbook, an encyclopedia, the official website on the subject). A date from memory never appears as certain.
3. Each milestone has its date in the most precise form the material gives (day, month and year; just the year; or the century), a title of six words at most and one line saying why it matters to the topic.
4. Order them from oldest to most recent. Two milestones from the same year go in the order they happened; if the material doesn't say which came first, both get "[ORDER TO CHECK]".
5. Don't add events from outside the topic or outside the period, even famous ones. If my material is missing an important milestone, suggest it in a separate list at the end, and never on the line itself.
6. Calculate where each milestone sits on the line of the length I gave, to scale: position = (milestone year - start year) ÷ (end year - start year) × length of the line. Write out the math for each milestone, round to the nearest quarter inch and say how much time each inch stands for.
7. Also write the timeline as Mermaid code (the timeline diagram), ready to paste, with one milestone per line in the format "year : title" and with no colons or semicolons inside the title, so the code doesn't break.
8. Close with three test questions about the order of the events and the distance between them, with the answer right below each one.
Format of the answer: first the table with the columns date, milestone, why it matters and the passage from the material it came from. Then the measurements for drawing it, milestone by milestone, with the math shown. Then the whole Mermaid code, in a single block ready to copy. Then the list of what to check (everything marked "[NO DATE IN THE MATERIAL]", "[CHECK]" or "[ORDER TO CHECK]") and the suggestions from rule 5. At the end, the three questions.
--- MY MATERIAL ---
[PASTE HERE THE TEXT FROM THE TEXTBOOK, THE HANDOUT OR YOUR NOTES]
How to use
AI-made timelines tend to look nice and still cost you points on a test: made-up dates, events from the same year in the wrong order, off-topic events, and every milestone the same distance apart, as if three years and thirty years were the same stretch. This prompt builds it only from what is in your material, flags what needs checking and gives back the table, the measurements for drawing it to scale and the code to paste. Works in ChatGPT, Claude and Gemini.
1. Paste the text from your textbook, handout or notes at the end.
2. Give the length of the line: that's where the measurements in inches come from.
3. Check every date marked [CHECK] or [NO DATE IN THE MATERIAL] before the final copy.
4. For a digital version, paste the code into Mermaid Live Editor and download the image.
5. For the poster board, mark the positions with a ruler, from the left end.
Tip: milestones bunched up in one stretch of the line are information too; they show when history sped up.
🍪 We use cookies. Some are essential for the site to work. Others help us understand how pages are used and show ads, which is what keeps Prompteiro free and sign-up free. Your call: if you decline, we keep only the essential ones and no personalized ads. Read the Privacy Policy.