| # | Title | Rating | Length |
|---|
| 1 | First Prologue. | | 1:01 |
| 2 | The dial is only visible by starlight. | | 1:16 |
| 3 | Every day at noon the sun shines through these apertures for the space of about a minute. | | 0:39 |
| 4 | The image of the sun indicates the sun's position as it passes through a hole in the concurve surface. | | 1:16 |
| 5 | There is a brass pointer fitted with sights and pivoted to the centre of the circle by which altitude observations are made. | | 0:49 |
| 6 | The chamber is no longer accessible to visitors. | | 1:00 |
| 7 | Access to any part of the engine is by steps which offer vantage points for various readings. | | 0:50 |
| 8 | Suspended in the hum of history. | | 1:10 |
| 9 | Originally cross wires stretched across each hemisphere, East to West and North to South. | | 1:17 |
| 10 | The ramped stair to the North of the two drums vanishes at thirty-two feet. | | 1:03 |
| 11 | These steps enable the observer to see all aspects of the brass calibration below. | | 0:40 |
| 12 | There is a huge calibrated sundial on each of its sides. | | 1:00 |
| 13 | This chamber is filled with garden tools and broken furniture. | | 1:00 |
| 14 | The mosaic of starlight slips back like the lid of an opening eye. | | 0:59 |
| 15 | This engine is primarily a calculator, though altitudes may be observed using the sighting bar fitted to the back. | | 1:00 |
| 16 | It is inscribed with concentric circles, at the centre of which lies a pointer. | | 1:01 |
| 17 | The calibrated parts are raised on three-foot pillars. | | 1:00 |
| 18 | The pink masonry charges the twilight with a faint sound. | | 0:59 |
| 19 | Another slope with stars for the reading of figures. | | 1:00 |
| 20 | This engine is now only visible in twilight. | | 1:00 |
| 21 | Here is an immense brass circle suspended vertically from stone supports. | | 0:49 |
| 22 | Two hemispheres representing the sphere of heaven comprise the two halves of this engine. | | 1:11 |
| 23 | This wall describes accurately the North/South meridian. | | 1:00 |
| 24 | There are pillars at the centre of each circular wall each open to the sky. | | 0:50 |
| 25 | First Memory. | | 1:10 |
| 26 | The sky has shaped this place. | | 1:01 |
| 27 | Here I find a central iron pole with hooks facing to the North, South, East and West. | | 0:59 |
| 28 | A shadow is cast to the West before noon. | | 0:59 |
| 29 | The shadow can fall in the vacant sector of a drum. | | 1:02 |
| 30 | Days and nights are measured here, and in the measuring seem longer, suspended somehow. | | 1:00 |
| 31 | The whole brass circle can be revolved around its vertical diameter so that altitude observations can be taken of any object at any time. | | 0:59 |
| 32 | A lofty but narrow chamber is contrived in the thickness of the walls and access is gained from a door opening from the masonry platform on which the engine stands. | | 0:37 |
| 33 | A further series of steps is only visible during the vernal equinox. | | 0:23 |
| 34 | Hold the machine in the vertical plane. | | 1:00 |
| 35 | Visible portions of the celestial sphere are represented by this map which has a movable elliptic which pivots at the point representing the pole. | | 1:02 |
| 36 | To move through these structures is to set them in motion. | | 0:59 |
| 37 | The altitude of the body observed is given while observing the vertically hanging bar through the two brass rings. | | 1:00 |
| 38 | A shadow is cast to the East after noon. | | 1:00 |
| 39 | These calibrations are no longer clearly visible. | | 1:00 |
| 40 | Another flight of observation steps and the sense of quiet rotation as I ascend. | | 1:01 |
| 41 | I study the vaults of a shell in which we float. | | 1:00 |
| 42 | Twenty-seven degrees, thirty-seven seconds. | | 1:00 |
| 43 | The roofs of the enclosed drums are implied by shadows. | | 1:00 |
| 44 | The floor and walls are calibrated to read altitude and azimuth. | | 1:00 |
| 45 | These are the cool engines of celestial map-making. | | 1:01 |
| 46 | Here is the Supreme Engine. | | 1:00 |
| 47 | The sun seen through the pair of brass rings is used by the bar to indicate the time from sunrise until sunrise. | | 1:01 |
| 48 | A pointer indicates on three arms: West, North and East. | | 1:00 |
| 49 | Here was the Supreme Engine. | | 0:59 |
| 50 | The engine of amplitude has a function which is no longer known. | | 1:01 |
| 51 | This engine is a rectangular brass plate. | | 1:00 |
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