HERE AND THERE (Celestial Navigation) |
with a nod to Stan Brakhage,
who knew how to fly |
******************************************************************************* Ephemeris / WWW_USER Wed Jun 9 12:40:27 2004 Pasadena, USA / Horizons ******************************************************************************* Target body name: Sun (10) {source: DE-0406LE-0406}
Center body name: Earth (399) {source: DE-0406LE-0406} Center-site name: (User Defined Site) ******************************************************************************* Start time : A.D. 2003-Apr-10 23:00:00.0000 UT Stop time : A.D. 2003-Apr-11 01:00:00.0000 UT Step-size : 1 minutes ******************************************************************************* Center geodetic : 359.883300, 51.5000, 0.00{E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 359.883300, 3978.6485, 4968.36{E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : High-precision EOP model {East-longitude +} Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole} Target pole/equ : IAU_SUN {East-longitude +} Target radii : 696000.0 x 696000.0 x 696000.0 k{Equator, meridian, pole} Target primary : Sun {source: DE-0406LE-0406} Interfering body: MOON (Req= 1737.400) km {source: DE-0406LE-0406} Deflecting body : Sun {source: DE-0406LE-0406}
Deflecting GM : 1.3271E+11 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL RTS-only print : NO EOP file : eop.040608.p040830 EOP coverage : DATA-BASED 1962-JAN-20 TO 2004-JUN-08. PREDICTS-> 2004-AUG-29 Units conversion: 1 AU= 149597870.691 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO ) Table cut-offs 2: Solar Elongation ( 0.0,180.0=NO ) ********************************************************************************************************************************************************************************************************************************* Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC R.A.__(a-apparent)__DEC Azi_(a-appr)_Elev APmag S-brt Illu% Ang-diam Ob-lon Ob-lat r rdot delta deldot 1-way_LT S-T-O Cnst N.Pole-RA N.Pole-DC ********************************************************************************************************************************************************************************************************************************* 2003-Apr-10 23:00 m 01 16 11.82 +08 03 07.7 01 16 19.78 +08 03 57.7 342.4614 -28.9660 -26.74 -10.59 100.0 1915.518 65.29 -5.94 0.0000000000 0.00000 1.0019691913 0.55287 8.333124 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:01 m 01 16 11.97 +08 03 08.6 01 16 19.93 +08 03 58.6 342.7394 -29.0123 -26.74 -10.59 100.0 1915.517 65.28 -5.94 0.0000000000 0.00000 1.0019694152 0.55168 8.333126 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:02 m 01 16 12.13 +08 03 09.5 01 16 20.09 +08 03 59.5 343.0177 -29.0578 -26.74 -10.59 100.0 1915.517 65.27 -5.94 0.0000000000 0.00000 1.0019696385 0.55048 8.333127 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:03 m 01 16 12.28 +08 03 10.5 01 16 20.24 +08 04 00.5 343.2963 -29.1027 -26.74 -10.59 100.0 1915.516 65.26 -5.94 0.0000000000 0.00000 1.0019698614 0.54928 8.333129 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:04 m 01 16 12.43 +08 03 11.4 01 16 20.40 +08 04 01.4 343.5752 -29.1468 -26.74 -10.59 100.0 1915.516 65.25 -5.94 0.0000000000 0.00000 1.0019700838 0.54809 8.333131 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:05 m 01 16 12.59 +08 03 12.3 01 16 20.55 +08 04 02.3 343.8543 -29.1902 -26.74 -10.59 100.0 1915.515 65.24 -5.94 0.0000000000 0.00000 1.0019703057 0.54689 8.333133 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:06 m 01 16 12.74 +08 03 13.2 01 16 20.70 +08 04 03.2 344.1337 -29.2329 -26.74 -10.59 100.0 1915.515 65.23 -5.94 0.0000000000 0.00000 1.0019705271 0.54569 8.333135 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:07 m 01 16 12.90 +08 03 14.1 01 16 20.86 +08 04 04.2 344.4134 -29.2748 -26.74 -10.59 100.0 1915.515 65.22 -5.94 0.0000000000 0.00000 1.0019707480 0.54448 8.333137 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:08 m 01 16 13.05 +08 03 15.1 01 16 21.01 +08 04 05.1 344.6933 -29.3160 -26.74 -10.59 100.0 1915.514 65.21 -5.94 0.0000000000 0.00000 1.0019709685 0.54328 8.333138 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:09 m 01 16 13.21 +08 03 16.0 01 16 21.17 +08 04 06.0 344.9734 -29.3565 -26.74 -10.59 100.0 1915.514 65.20 -5.94 0.0000000000 0.00000 1.0019711884 0.54208 8.333140 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:10 m 01 16 13.36 +08 03 16.9 01 16 21.32 +08 04 06.9 345.2538 -29.3962 -26.74 -10.59 100.0 1915.513 65.19 -5.94 0.0000000000 0.00000 1.0019714079 0.54087 8.333142 0.0000 Psc 286.13000 63.87000 2003-Apr-10 23:11 m 01 16 13.52 +08 03 17.8 01 16 21.48 +08 04 07.8 345.5345 -29.4352 -26.74 -10.59 100.0 1915.513 65.19 -5.94 0.0000000000 0.00000 1.0019716269 0.53966 8.333144 0.0000 Psc 286.13000 63.87000 2 NOTE: "n.a." in output means quantity "not available" at the print-time. SOLAR PRESENCE Time tag is followed by a blank, then a solar-presence symbol: '*' Daylight (refracted solar upper-limb on or above apparent horizon)
'C' Civil twilight/dawn 'N' Nautical twilight/dawn 'A' Astronomical twilight/dawn ' ' Night OR geocentric ephemeris LUNAR PRESENCE WITH TARGET RISE/TRANSIT/SET MARKER The solar-presence symbol is immediately followed by another marker symbol: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric 'r' Rise (target body on or above cut-off RTS elevation) 't' Transit (target body at or past local maximum RTS elevation) 's' Set (target body on or below cut-off RTS elevation)
Until we learnt to close the screens the moths would
come and cloud the room with shadows.
Now, just a few late sleepers remain clinging to
the mesh when day returns.
In the morning a brisk towhee turns up promptly,
with an outsized baby who mews for breakfast wings. The supply of tasty,
misguided travellers seems endless.
And round again,
from day
to night.
There, the stars were always invisible, and the sky
was never dark. I coasted from one pool
of lamplight to another.
Here, the moon and stars illuminate a new expanse. And when a falling tree brings down the power lines, night is simply black.
All you can do is wait,
holding your position;
hopeful
that things will eventually work out.
And round again,
from here
to there.
At first the night was so immense
I needed a torch
to stumble
to the gate.
This year I stand outside at midnight, charting my position
by the scent of the hemlock, the whirring crickets, and the soft chomp of
a passing deer.
A moth performs a slow circumnavigation of this vast
world we share,
keeping the probable moon at his left, trusting he made
the right decision.
And round again,
from dark
to light.