Change over time

Spiral time-series chart

Wraps time around a spiral so recurring cycles can be compared across turns.

What it answers

Do patterns recur at the same point in each cycle?

The question

Does demand peak at the same point every year?

Each turn is one year, starting inside with 2023. Larger, pinker dots mean higher demand. Every year peaks in November to December.

Illustrative data. It belongs to no company.

Exploring cyclic patterns over repeated periods.

When precise chronological lookup or accessible linear reading is primary.

Follow time around turns and compare matching angular positions.

Define cycle length and radial progression.

Layout: Long table
Fields: Time: date/datetime or ordered number; Value: number
One row is: One observation at a time or ordered position. What is the grain?
Rules: Parse dates consistently and sort ascending. Resolve duplicate timestamps by a declared rule. Missing values are not automatically zero.
Optional: Optional Series. Use regular spacing for methods requiring it.
Preparation: Define the cyclic period, map time to angle and successive cycles to radius, and retain clear chronological labels.
Units: Time uses a stated date/time unit and sampling period; the value axis uses the measure's unit. Rates need their own explicit denominator.

A long table: one row per observation, few columns. New data adds rows.

Data Jan 2025=30, Jan 2026=38. Place both at the January angle on successive turns. The second value is larger.