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Fig. 3 (a) Horizon profile and sky looking north from Scregg passage tomb (SMR: RO042-090---) computed using Horizon v. 0.13a (Smith, 2020), valid for c. 3000 BC with additions by the
author; (b) Scregg passage tomb looking north (photo. F Prendergast). The cairn is denuded but
kerbstones are extant. Sides formed of single limestone slab and roof of single large stone. The
plan shape of chamber is undifferentiated (rectangular). It has an isolated setting on the crest of hill
with commanding views including of the distant north horizon. The passage axis has an indicative
azimuth of 146° and an astronomical declination −28°; (c) horizon distances surrounding Scregg
computed using Horizon v. 0.13a with NASA SRTM one arc second resolution terrain height data.
The viewshed is scaled in 10 km distance bands
F. Prendergast
Fig. 3 (a) Horizon profile and sky looking north from Scregg passage tomb (SMR: RO042-090---) computed using Horizon v. 0.13a (Smith, 2020), valid for c. 3000 BC with additions by the
author; (b) Scregg passage tomb looking north (photo. F Prendergast). The cairn is denuded but
kerbstones are extant. Sides formed of single limestone slab and roof of single large stone. The
plan shape of chamber is undifferentiated (rectangular). It has an isolated setting on the crest of hill
with commanding views including of the distant north horizon. The passage axis has an indicative
azimuth of 146° and an astronomical declination −28°; (c) horizon distances surrounding Scregg
computed using Horizon v. 0.13a with NASA SRTM one arc second resolution terrain height data.
The viewshed is scaled in 10 km distance bands
F. Prendergast