Clavius, Christoph
,
Gnomonices libri octo, in quibus non solum horologiorum solariu[m], sed aliarum quo[quam] rerum, quae ex gnomonis umbra cognosci possunt, descriptiones geometricè demonstrantur
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GNOMONICES
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gio Boreali, quia à ſtylo remouetur verſus ortum, vmbra ſtyli proijcitur, dum Sol eſt in ſemicirculo oc-
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cidentali ſupra Horizontem, quocirca eadem illa hora ab occaſu Solis erit numeranda. </
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<
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">Eadem{q́ue} eſt ratio
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de cæteris lineis horarijs. </
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<
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23. </
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<
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<
s
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xml:space
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caſu numerandæ ſunt, vt dictum eſt. </
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<
s
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xml:space
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">Quod in aliis quoque horologiis intelligi volumus, etiam inclinatis
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ad Horizontem, ſumendo inferiora horologia pro Borealibus, vt ſuis locis monebimus.</
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<
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<
s
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xml:space
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">EX horologio Verticali à nobis deſcripto perſpicuum eſt, Federicum Commandinum in ſuo libro de
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us Com
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mandinus non
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rectè ducit hor.
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10. & 11. ab occ.
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in horologio
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Boreali Italico.</
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horologiorum deſcriptione hallucinatum fuiſſe in lineis horarum 10. </
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<
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<
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ci Septentrionalis. </
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<
s
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xml:space
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">Tribuit enim illis eundem prorſus ſitum, quem habent lineæ horarũ 23. </
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<
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<
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fieri non poteſt, vt ex noſtra conſtructione conſtat.</
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<
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<
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<
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xml:space
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">HOROLOGIVM Antiquum Verticale conſtituere.</
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<
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</
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<
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<
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xml:space
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">CIRCVLO M a N b, diuiſo, vt in propoſ. </
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<
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xml:space
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<
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">22. </
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<
s
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xml:space
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">huius libri factum eſt, in arcum diur-
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<
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xlink:label
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xml:space
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">Deſctiptio ho-
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rologii Antiqui
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@etticalis.</
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num, & </
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<
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">nocturnum tropicorum ♋, & </
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<
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">arcus diurnus tam tropici ♋, a N b, quàm tropici ♑,
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<
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d N e, ſecetur in partes 12. </
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<
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xml:space
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">æquales, initio facto à punctis a, & </
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<
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xml:space
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">d, quæ orientalia ſunt, vt patet, ſi
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horologium, & </
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>
<
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xml:space
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">circulus dictus propriam poſitionem habeant. </
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<
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xml:id
="
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xml:space
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">Ex punctis enim diuiſionum inue-
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niemus puncta horarum inæqualium in vtroque tropico, horologiumq́; </
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>
<
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">Antiquum abſoluemus,
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vt propoſ. </
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<
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<
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">huius libri tradidimus. </
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<
s
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xml:space
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">Vt exempli gratia, in auſtrali horologio linea recta ex f, pun-
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cto horæ 4. </
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>
<
s
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xml:space
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">inæqualis tropici ♋, per E, ducta ſecat lineam æquinoctialem in g; </
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<
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xml:space
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">Recta verò ex H,
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per g, ducta ſecat tropicum ♋, in h, puncto horæ 4. </
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<
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<
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xml:space
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ræ 4. </
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<
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xml:space
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">inæqualis tropici ♑, per E, ducta ſecat æquinoctialem lineam in n; </
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<
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xml:space
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<
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xml:space
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♑, ſecat in p, puncto horæ 4. </
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<
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<
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<
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<
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<
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<
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demq́ue ratio de cæteris habenda eſt. </
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<
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xml:space
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">Pro horologio boreali exemplum non ponimus, tum quia
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ex dictis in propoſ. </
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<
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<
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xml:space
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">huius libri facile deſcribetur, tum etiam, quia ſatius eſt, illud ex auftrali de-
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<
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riuare, vt in ſequenti ſcholio mox docebimus.</
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</
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<
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<
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xml:space
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">QVOD ſi deſcribatur arcus diurnus horarum 6. </
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<
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xml:space
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</
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horologii Anti
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qui Verticalis,
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ex arcubus diur
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nis, nocturnis-
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que.</
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conficiemus idem horologium, vt de horizontali dictum eſt propoſ. </
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<
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<
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<
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">Nam hora
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1. </
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<
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">inæqualis in auſtrali horologio ducitur per horam 9 {1/2}. </
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<
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xml:space
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">à media nocte in arcu diurno horarum
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6. </
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<
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<
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<
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">à media nocte in arcu diurno horarum 12. </
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<
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xml:space
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">Item per horam 4 {1/2}. </
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>
<
s
xml:id
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xml:space
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">à meridie in
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arcu nocturno horarum 18. </
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<
s
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xml:space
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">vt tabulæ in ſcholio propoſ. </
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<
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<
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<
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ſic de cæteris. </
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>
<
s
xml:id
="
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xml:space
="
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">In boreali verò horologio tranſit eadem hora 1. </
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>
<
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">inæqualis per horam 4 {1/2}. </
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>
<
s
xml:id
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xml:space
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">à media
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nocte in arcu diurno horarum 18. </
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<
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<
s
xml:id
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">per horam 9 {1/2}. </
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>
<
s
xml:id
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">à meridie in arcu nocturno horarum 6. </
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>
<
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xml:id
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xml:space
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">Item
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per horam 7. </
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>
<
s
xml:id
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xml:space
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">à meridie in arcu nocturno horarum 12. </
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>
<
s
xml:id
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"
xml:space
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">vt eædem tabulæ docent, &</
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>
<
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xml:space
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">c. </
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<
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xml:id
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<
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igitur Antiquum Verticale conſtuimus. </
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<
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xml:space
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