Sunspot Positions and Areas from Observations by Thomas Harriot

Astronomical algorithms

Choice Reviews Online · 1992 · 843 citations

Astronomical Formulae, Astronomical Coordinate System, Second Edition +8

Group Sunspot Numbers: A New Solar Activity Reconstruction

Douglas V. Hoyt, Kenneth H. Schatten · Solar Physics · 1998 · 613 citations

Group Sunspot Numbers: A New Solar Activity Reconstruction

Douglas V. Hoyt, Kenneth H. Schatten · Solar Physics · 1998 · 464 citations

The classification of sunspot groups

P. S. McIntosh · Solar Physics · 1990 · 370 citations

Engineering, Sunspot Groups, Solar Physic +3

Visualization of the challenges and limitations of the long-term sunspot number record

Andrés Muñoz‐Jaramillo, J. M. Vaquero · Nature Astronomy · 2018 · 112 citations · Full text

Engineering, Data Science, Solar Energetic Particle +5