SILSO daily total sunspot number v2.0 · 1818-01-01 → 2026-08-31 · 76,214 days,
one value per day, no smoothing between you and the number.
drag pan ·
←→ pan ·
+- zoom ·
F full ·
C longest cycle (12.5 yr) ·
R three rotations (81 d) ·
Z the 92-day hole ·
S spotless layer ·
N station-count layer
hover a day ·
the readout