Station report
Point Potrero, Richmond, in 2 sheets Drawn from the register, in the manner of the Field Book, and opened beside the plates that explain each part of it.
1 The sun2 The instrumentOn Oct 11 the noon sun stands 45 degrees above the horizon at 37.91 N, and the day is 11 h 14 min long. Level ground there takes 71 per cent of the noon sunlight a surface facing the sun would.
Elevation of the noon sun at Point Potrero, Richmond, angles true: on Oct 11 it stands 45 degrees above the horizon, against 76 at the June solstice, 52 at the equinoxes and 29 at the December solstice; the day is 11 h 14 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 NDBC-PPXC1 FIG. E THE SUN AT POINT POTRERO, RICHMOND 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 76° EQUINOXES 52° DECEMBER SOLSTICE 29° OCT 11, 45° SOUTH ANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLY DAY LENGTH 11 H 14 MIN LEVEL GROUND TAKES 71 PER CENT OF THE NOON SUN A FACING SURFACE WOULD LATITUDE 37.91 N; THE SUN'S DECLINATION -7.3° TITLE Point Potrero, Richmond, the sun STATION REPORT · DCP NDBC-PPXC1 TYPE ELEVATION SCALE ANGLES TRUE REV FROM THE REGISTER SHEET 1 of 2 DATE 2026-10-11 ID SR-NDBCPPXC1-1 DRAWN AS linework on paper SOURCES FB-ENG-007 A data collection platform. Its sensors, as its network builds them.
Elevation of a data collection platform, Point Potrero, Richmond, each sensor drawn and labelled with what it read: no reading in the last day. 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 NDBC-PPXC1 FIG. F THE INSTRUMENT ELEVATION OF A DATA COLLECTION PLATFORM, EACH SENSOR WITH WHAT IT READ ANTENNA, SENDING BY SATELLITE - AIR TEMPERATURE - PRECIPITATION GAUGE - SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALE TITLE Point Potrero, Richmond, the instrument STATION REPORT · DCP NDBC-PPXC1 TYPE ELEVATION SCALE SCHEMATIC REV FROM THE REGISTER SHEET 2 of 2 DATE 2026-10-11 ID SR-NDBCPPXC1-2 DRAWN AS linework on paper SOURCES FB-INS-001 
FB-ENG-007, Fig. ARadiation budget
FB-INS-001, Fig. AWhat an instrument is