151. Harley MS 321, f 23r Reference (shelfmark): Harley MS 321, f 23r Title: Canon annuli perpetui Scope & Content: A text entitled 'Canon annuli perpetui'; incipit: 'Nota q[uod] in annulo [com]pota sunt'. Collection Area: Western Manuscripts Languages: Latin Date Range: 1st quarter of the 15th century Extent: 1 folio.
152. Harley MS 321, f 28v (item 1) Reference (shelfmark): Harley MS 321, f 28v (item 1) Title: Notabilia de etatibus mundi Scope & Content: Rubric: 'Notabilia de etatibus mundi'; incipit: 'nota quod sed conputacionem'. Collection Area: Western Manuscripts Languages: Latin Date Range: 1st quarter of the 15th century Extent: 1 folio.
153. Harley MS 321, f 28v (item 2) Reference (shelfmark): Harley MS 321, f 28v (item 2) Title: Tractatus de sphera Scope & Content: Rubric: 'Tractatus de sphera'; incipit: 'De causis eclipsil sol et lune.' Collection Area: Western Manuscripts Languages: Latin Date Range: 1st quarter of the 15th century Extent: 1 folio.
154. Harley MS 321, f 28v (item 3) Reference (shelfmark): Harley MS 321, f 28v (item 3) Title: De coniunctione et eclipsi planetarum Scope & Content: Rubric: 'De coniunctione et eclipsi planetarum'; incipit: 'de rota [...] generalis de almanac.' Collection Area: Western Manuscripts Languages: Latin Date Range: 1st quarter of the 15th century Extent: 1 folio.
155. Harley MS 321, f 29r (item 1) Reference (shelfmark): Harley MS 321, f 29r (item 1) Title: De praefagio future constitutionis aerae Scope & Content: Rubric: 'De praefagio future constitutionis aerae'; incipit : 'A sole.' Collection Area: Western Manuscripts Languages: Latin Date Range: 1st quarter of the 15th century Extent: 1 folio.
156. Harley MS 321, f 29r (item 2) Reference (shelfmark): Harley MS 321, f 29r (item 2) Title: De motu lune Scope & Content: Rubric: 'De motu lune'; incipit 'motus autem lune...' Diagram in brown and yellow of the movements of the moon (f. 29r). Collection Area: Western Manuscripts Languages: Latin Date Range: 1st quarter of the 15th century Extent: 1 folio.
157. Harley MS 321, f 37v Reference (shelfmark): Harley MS 321, f 37v Title: Notes about lunar months. Scope & Content: Notes about lunar months. Collection Area: Western Manuscripts Languages: Latin Date Range: 1st half of the 15th century Extent: 1 folio.
158. Harley MS 321, ff 1r-1v Reference (shelfmark): Harley MS 321, ff 1r-1v Title: Title page and tables of contents Scope & Content: The title 'Rudimenta astronomica' and a table of contents added by William Camden (d. 1623). Collection Area: Western Manuscripts Languages: Latin Date Range: 4th quarter of the 16th century - before 1623 Extent: 1 folio.
159. Harley MS 321, ff 2r-14r Reference (shelfmark): Harley MS 321, ff 2r-14r Title: Calendar from 1387 to 1462 (Calendarium minus and calendarium majus) Scope & Content: Calendar from 1387 to 1462 (Calendarium minus and calendarium majus). Decoration: Images of solar and lunar eclipses in black and red illustrating the calendar. Collection Area: Western Manuscripts Languages: Latin Date Range: 1387-1424 Extent: 12 leaves and 1 page.
160. Harley MS 321, ff 16r-16v Reference (shelfmark): Harley MS 321, ff 16r-16v Title: Divisio temporum secundum auctores antiquos Scope & Content: Divisio temporum secundum auctores antiquos; incipit: 'Auctores artis compotis plures fuerunt.' Decoration: Initial in blue with red pen-flourishing. Collection Area: Western Manuscripts Languages: Latin Date Range: c 1387-1st quarter of the 15th century Extent: 1 folio.