THRESHOLD COMPLEX EXPLORATION LOG
Designation / Log ID: 67-L64
Apparent Date/Time: 14 October 2026 / 09:18 (local) — secondary stamp reads 03:44 19 July 1963
Entry Method: Pair of double doors marked “P-68 PLANETARIUM – STAFF ONLY”. Exterior clear aperture measures 1.62 m × 2.11 m. Interior aperture measures 1.47 m × 2.28 m on entry and 1.71 m × 1.93 m on exit.
Environmental Baseline
Lighting: projected star field across hemispherical ceiling, color temperature measured at 2850 K. Intensity constant at 4.7 lux.
Ambient temperature: 21.4 °C. Humidity: 47 %.
Background sound: continuous low-frequency projector motor at 0.6 Hz. Baseline reading 18 dB.
Air movement: none detected. Barometric pressure 1011.8 hPa on entry; 1006.3 hPa after 4.1 m of travel.
Spatial Observations
Gallery estimated 19 m diameter by 7.2 m high at center. Laser measurement returns 22.6 m diameter by 6.4 m high at center.
Floor: carpeted seating tiers in concentric rings. Carpet pile measures 8 mm. Surface remains uniform under repeated contact.
Walls: none. Hemispherical projection surface meets floor at perimeter. Surface texture measures 0.2 mm grain.
Ceiling: continuous hemispherical screen. Fixture count remains one central projector after nine visual inventories.
Repeating motif: every 1.2 m a numbered seat occupies a tier. Seat back height measures 910 mm. Upholstery finish is identical across all units.
Anomalies
Visual inventory of projected stars returns 147. Physical inventory of lamp filaments returns 0. Measured illuminated-star count equals 147 while calculated residual occupancy across the same field equals 0.
Floor remains level under spirit level. Measured residual dust film on the lower seat backs slopes 2.3° toward the outbound aisle. Slope reverses after 5 minutes of continuous observation without change in physical orientation.
Posted occupancy plaque reads 84 SEATS / 0 SHOWS. Measured combined lamp current at the projector equals 0.0 A. Seal integrity lights on the fire doors remain green.
Sound of residual projector click arrives 1.8 seconds after the corresponding surface disturbance is detected. Delay increases by 0.22 s for every additional 1.0 m of distance from the entry doors.
Humidity at mid-gallery remains 47 % while residual dust film forms on the seat-edge surfaces after 6 minutes of observation. Film disperses without measurable change in local humidity.
Local magnetic field strength measures 0.4 gauss at floor level and 1.9 gauss at 1.5 m height. Field direction reverses after 8 minutes without change in gallery state.
Star count on the open projection field decreases by 19 over 9 minutes while measured lamp current at the projector remains 0.0 A.
Surface of residual dust on seat-edge surfaces exhibits electrostatic cling of 2.9 cm against vertical surfaces. Cling collapses after 41 seconds without measurable change in local charge.
Exit / Continuity Status
Exit achieved via the same double doors. Exterior aperture measures 1.62 m × 2.11 m on departure.
Residual effect: instrument clock advances 00:00:07 during 11-minute interior interval. Secondary stamp remains fixed at 03:44 19 July 1963.
Continuity status: resolved.