Darker cells mean a higher score for this topic on that metric.
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Quick answers
When should I pick Timeline?
When the story is: ordered events, eras, project milestones.
When should I avoid Timeline?
Skip it in cases like: you need quantities changing, not just dates.
Who invented or popularised it?
Joseph Priestley’s 1765 Chart of Biography inspired later atlases
What does it encode?
position along an ordered time axis
Is it OK in ads?
Yes if one claim is visible at a glance in Meta, Google and retail print; otherwise link to a full figure.
Will a teacher accept it?
Yes for lab reports and poster boards if axes, units and a source line are present.
Timeline encodes values as position along an ordered time axis. Joseph Priestley’s 1765 Chart of Biography inspired later atlases.
In reports, ads and assignments it fits ordered events, eras, project milestones. Skip it when you need quantities changing, not just dates.
Parts
- Mark — The core mark of Timeline is position along an ordered time axis.
- Scale — The scale must show zero (or a declared break) and units.
- Axis — Axis titles name the variable, not a mood.
- Legend — A legend is weaker than a direct label. Write beside the mark when you can.
- Label — Numbers are optional. If comparison is the job, label the ends only.
- Grid — Keep the grid faint. Data should own the ink.
- Annotation — One annotation sentence. Date the source.
- Frame — A thin frame. Never a 3-D box.
Variants
- Chronology — Variant 1 of Timeline (Chronology). Same encoding, different layout.
- Gantt cousin — Variant 2 of Timeline (Gantt cousin). Same encoding, different layout.
- History rail — Variant 3 of Timeline (History rail). Same encoding, different layout.
- Timeline 4 — Variant 4 of Timeline (Timeline 4). Same encoding, different layout.
Labels
- Axis — On Timeline, make Mark readable.
- Legend — On Timeline, make Scale readable.
- Label — On Timeline, make Axis readable.
- Grid — On Timeline, make Legend readable.
- Annotation — On Timeline, make Label readable.
Timeline: honour position along an ordered time axis, and switch when you need quantities changing, not just dates.