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  "path": "/space/astronomy-space/a-400-year-old-kepler-drawing-solves-mystery-around-70-year-solar-quiet-period/",
  "publishedAt": "2026-04-15T12:35:59.000Z",
  "site": "https://www.zmescience.com",
  "tags": [
    "Astronomy",
    "History",
    "News",
    "Space",
    "camera obscura",
    "carbon-14",
    "Johannes Kepler",
    "Maunder Minimum",
    "solar activity",
    "solar cycle",
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    "space weather",
    "sun",
    "sunspots",
    "tree rings"
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  "textContent": "A 17th-century astronomer's blunder just solved a fierce debate about the Sun's magnetic history.",
  "title": "A 400-Year-Old Kepler Drawing Solves Mystery Around 70-Year Solar Quiet Period"
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