Earth, 4.6 billion years, in sections

The top bar is the whole of it. Tap a period and the blue window settles on it and it opens as a line of its own; tap again and it closes. Drag the window’s ends and the line below follows; they click onto a period’s edges. A line that has nothing more underneath, and that is the point. Drag the copper marker, or tap a dot, for the year. The faint tail behind a dot is where the thing probably began, before the oldest evidence of it.

The sections are cut where the evidence changes kind, and each bar says what it is known from. The marks are the deep-time events (../stories/deep-time-events.json, seventy of them, written and checked in October); tap one, then More. Hazen's The Story of Earth for the colours and the chunks.