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Fig 5. This graph of the Sun's position over Seguin, Texas, on 21, April 1996 shows how the Sun's angle, hence the air mass (m) changes much faster in the early morning and late afternoon than at midday. This graph is from "SunTime" by Zephyr Svcs. (1900 Murray Ave., Pittsburgh, PA 15217 USA).
Fig. 5, Sun position




    Date:	21 Apr 1996

   Place:	Seguin, Texas

     Lat:   	29 deg. 37' North

     Lon:	97 deg. 56' West Z=6

     

    Rise:	05:59

     Azm:	075 deg. 36'

     

     Set:	19:03

     Azm:	284 deg. 35'

     

Twilight:   	04:34/20:26

Hrs. Sun:	13:04

 Mas Alt:	72.8 deg. @ 12:31
 

Time	Alt	Azm

06:30	6.0	79.4

07:00	12.3	83.0

07:30	18.8	86.5

08:00	25.3	90.1

08:30	31.8	94.0

09:00	38.3	98.2	

09:30	44.7	102.9

10:00	51.0	108.6

10:30	57.1	115.7

11:00	62.7	125.1

11:30	67.6	138.1

12:00	21.2	156.4

12:30	72.5	179.6

13:00	71.2	203.1

13:30	67.7	221.6

14:00	62.8	234.8

14:30	57.2	244.2

15:00	51.2	251.4

15:30	44.9	257.1

16:00	38.5	261.8

16:30	32.0	266.1

17:00	25.5	269.9

17:30	19.1	273.5

18:00	12.6	277.1

18:30	6.2	280.6

TERC VHS-1 Sun Photometer: [ Figures and Illustrations Index ] [ Manual TOC ]

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