Sun4all Guidebook

Original Title:

    Sun4all

        Keywords:

        sun photosphere spots solar prominences filaments

        Description:

          Sun4all guidebook is a very nice introduction to the Sun with suggestions of many interesting activities using images from the Sun taken by the Astronomical Observatory of Coimbra (archives since 1926).
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                  Creative Commons License
                  The license of the work Sun4all Guidebook by rdoran
                  permits: reproduction, distribution , adaptation
                  requires: indication of the license governing the work, attribution and to share derivatives with the same license
                  prohibits: commercial use of the work
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