Tromso Sun Time Samples
no night date: 
Vancouver : Jun 7 - Jun 4
Yellowknife: 5.29-7.14
In UTC
astronomical_twilight_begin: May-27 09:06:46 
nautical_twilight_begin: May-27 10:35:52 
civil_twilight_begin: May-27 11:32:28 
sunrise: May-27 12:13:26 
transit: May-27 20:09:05 
sunset: May-28 04:04:43 
civil_twilight_end: May-28 04:45:42 
nautical_twilight_end: May-28 05:42:18 
astronomical_twilight_end: May-28 07:11:23 

		No Day		No night 	No A		No N		No C
Tromso	11.27-1.14	3.27-9.16	4.12-8.31	4.29-8.14	5.18-6.25

Tromso	
11.27-1.14	No day
3.27-9.16	No night
4.12-8.31	No A twi
4.29-8.14	No N twi
5.18-6.25	No C twi

Timeanddate： 9.17 Night分为了两段：12:21am-12:57am 11:51pm-12:00am 
是同一天的两个零点前和后的问题，第一段因为前一天没有黑夜，所以12：00am-12:20am这一段不是黑夜
这点比较头疼。

Yellowknife lat: 62.471 lon: -114.44
sunrise: May-17 04:30:03 
astronomical_twilight_end: --- 
civil_twilight_begin: May-17 03:02:55 
transit: May-17 13:34:12 
sunset: May-17 22:38:21 
astronomical_twilight_begin: --- 
civil_twilight_end: May-18 00:05:29 
nautical_twilight_begin: --- 
nautical_twilight_end: ---