skymap notes cleanups

README-skymap.md

@@ -26,39 +26,69 @@ Run skymap (with my branch):
 ```
 #!/bin/bash
 
-LENGTH=86400 # Seconds, 86400 = 1 day
-TIME="2022-11-12T12:50:00.000"
+LENGTH=86400
+TIME="2022-11-19T17:20:45.000"
 TLE=~/devel/spacecruft/TLE/bluewalker3/bluewalker3.tle
+SITE=9990
+LAT="40.568912"
+LONG="-105.225852"
+# Set elevation in data/sites.txt
+# 9990 JM  40.568912  -105.225852     1843    Jeff Moe
+#ELEVATION="1843"
 
 skymap									\
-	-s 9920								\
 	--no-stars							\
 	--width=1600							\
 	--height=1000							\
 	--all-objects							\
 	--nmax=128							\
-	-l ${LENGTH}							\
-	-c ${TLE}							\
-	-t ${TIME}
+	--length=${LENGTH}						\
+	--catalog=${TLE}						\
+	--latitude="${LAT}"						\
+	--longitude="${LONG}"						\
+	--time="${TIME}"
 ```
 
 ![skymap tutorial 1](img/skymap-tutorial-01.png)
 
 
-That's a 24h prediction for BW3 for your location. Grey tracks are in the shadow, orange tracks are in sunlight but during daytime, yellow tracks are in sunlight but during night time
+That's a 24h prediction for BW3 for the example location.
+
+* Grey tracks are in the shadow.
+* Orange tracks are in sunlight but during daytime.
+* Yellow tracks are in sunlight but during night time.
 
 
-So you have two passes during night time. Low South East, and low South West
-Now in interactive mode, use `l` to change the track length to 3600 secs (1 hour)
+The example has two passes during night time:
+
+* Low South East.
+* Low South West.
+
+In interactive mode, use `l` to change the track length to 3600 secs (1 hour).
 Then use `.` to move time forward with these 1 hour steps.
 
 At some point you'll get the first pass.
-then use `<` a few times to reduce the timestep size to something like 450 seconds and then step forward with `.` until it is above the horizon
+Then use `<` a few times to reduce the timestep size to something like 450 seconds.
+Then step forward with `.` until it is above the horizon.
+
+Moving time forward to `00:37:37`:
+Pressing `i` with the cursor near 53807 gives you the az/el and RA/Dec to read off.
 
 
-This is what I get moving time forward to 00:37:37
-pressing `i` with the cursor near 53807 gives you the az/el and RA/Dec to read off
-10:27
+Cees dumped the TLE for `53807` into a text file with
 
-I dumped the TLE for 53807 into a text file with tleinfo -i 53807 >53807.txt
+```
+tleinfo -i 53807 >53807.txt
+```
+
+This results in two TLEs, though ? XXX compare with TLE from above.
+
+```
+BLUEWALKER-3            
+1 53807U 22111AL  22291.57105995  .00000747  00000+0  51211-4 0  9998
+2 53807  53.2021  96.3521 0013619  43.3355 316.8709 15.18466480  5717
+0 BLUEWALKER 3
+1 53807U 22111AL  22291.57105995  .00000747  00000-0  51211-4 0  9999
+2 53807  53.2021  96.3521 0013619  43.3355 316.8709 15.18466480  5717
+```