Station report
Arecibo Observatory, in 3 sheets Drawn from its report of Oct 10, 2026, 6:00 AM local time, in the manner of the Field Book, and opened beside the plates that explain each part of it.
1 The column2 The sun3 The instrumentAt 1,062 ft above sea level, 4 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 28.79 inHg and the temperature at 55.2 F; it reports 71.0 F, 15.8 F warmer than standard.
Section from sea level of where Arecibo Observatory stands in the atmosphere, height to scale: the station 1,062 feet above sea level with 4 per cent of the air below it; the standard atmosphere's pressure there, 28.79 inches of mercury, and temperature, 55.2 degrees Fahrenheit. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 A A B B C C D D E E © 2026 STORM STATION 247 THE FIELD BOOK STATION REPORT ARBP4 FIG. D WHERE ARECIBO OBSERVATORY STANDS IN THE ATMOSPHERE SECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHERE FT ABOVE SEA LEVEL 0 5,000 10,000 15,000 SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHERE ARECIBO OBSERVATORY 4 PER CENT OF THE AIR BELOW IT 1,062 FT 10 PER CENT OF THE AIR BELOW, 2,890 FT 20 PER CENT OF THE AIR BELOW, 6,050 FT 30 PER CENT OF THE AIR BELOW, 9,540 FT 40 PER CENT OF THE AIR BELOW, 13,470 FT STANDARD PRESSURE HERE 28.79 inHg STANDARD TEMPERATURE HERE 55.2 F TEMPERATURE, REPORTED 71.0 F TITLE Arecibo Observatory, the column STATION REPORT · COOP ARBP4 TYPE SECTION SCALE HEIGHT TO SCALE REV AS REPORTED SHEET 1 of 3 DATE 2026-10-10 ID SR-ARBP4-1 DRAWN AS linework on paper SOURCES FB-ENG-001, FB-ENG-003 On Oct 10 the noon sun stands 65 degrees above the horizon at 18.35 N, and the day is 11 h 42 min long. Level ground there takes 91 per cent of the noon sunlight a surface facing the sun would.
Elevation of the noon sun at Arecibo Observatory, angles true: on Oct 10 it stands 65 degrees above the horizon, against 85 at the June solstice, 72 at the equinoxes and 48 at the December solstice; the day is 11 h 42 min long. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 A A B B C C D D E E © 2026 STORM STATION 247 THE FIELD BOOK STATION REPORT ARBP4 FIG. E THE SUN AT ARECIBO OBSERVATORY ELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUE THE STATION JUNE SOLSTICE 85° EQUINOXES 72° DECEMBER SOLSTICE 48° OCT 10, 65° SOUTH ANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLY DAY LENGTH 11 H 42 MIN LEVEL GROUND TAKES 91 PER CENT OF THE NOON SUN A FACING SURFACE WOULD LATITUDE 18.35 N; THE SUN'S DECLINATION -6.8° TITLE Arecibo Observatory, the sun STATION REPORT · COOP ARBP4 TYPE ELEVATION SCALE ANGLES TRUE REV AS REPORTED SHEET 2 of 3 DATE 2026-10-10 ID SR-ARBP4-2 DRAWN AS linework on paper SOURCES FB-ENG-007 A cooperative observer's station, 1,062 ft above sea level. Its report of Oct 10, 2026, 6:00 AM local time is written on the sensors that made it.
Elevation of a cooperative observer's station, Arecibo Observatory, each sensor drawn and labelled with what it read: thermometer in its shield, 5 ft, high 89.0 f, low 68.0 f; standard 8 inch rain gauge, 0.00 in. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 A A B B C C D D E E © 2026 STORM STATION 247 THE FIELD BOOK STATION REPORT ARBP4 FIG. F THE INSTRUMENT ELEVATION OF A COOPERATIVE OBSERVER'S STATION, EACH SENSOR WITH WHAT IT READ, OCT 10, 2026, 6:00 AM LOCAL TIME THERMOMETER IN ITS SHIELD, 5 FT HIGH 89.0 F, LOW 68.0 F STANDARD 8 INCH RAIN GAUGE 0.00 IN SNOW BOARD AND MEASURING STAKE - SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALE TITLE Arecibo Observatory, the instrument STATION REPORT · COOP ARBP4 TYPE ELEVATION SCALE SCHEMATIC REV AS REPORTED SHEET 3 of 3 DATE 2026-10-10 ID SR-ARBP4-3 DRAWN AS linework on paper SOURCES FB-INS-001, FB-INS-009, FB-INS-003 
FB-ENG-001, Fig. AAtmosphere in section
FB-ENG-003, Fig. CHydrostatic balance
