Buoy 46770

sailwx.info

Track history (hours):
 
Tides and Currents Weather Stations Pressure Air Temp Water Temp Dewpoint Dewpoint Depression Visibility Wind Speed Wind Dir Waves Ship Positions

Drifting buoy 46770

Last reported at 2016-Feb-09 17:00 UTC. Time now 2016-Feb-09 20:41 UTC.
Position N 43°17' W 169°45'.

Barometer 976.0 mb
Water temperature 7.6 ° C

Date/timePositionNaut miles runAvg speedWind from/ knotsBaromVisibWave heightAir tempDewpointWater temp
2016-Feb-09 17:00N 43°17' W 169°45'1 1.1 976.0 7.6
2016-Feb-09 16:00N 43°18' W 169°46'1 1.1 975.2 7.6
2016-Feb-09 15:00N 43°17' W 169°45'2 1.0 974.7 7.6
2016-Feb-09 13:00N 43°18' W 169°46'2 0.4 973.8 7.7
2016-Feb-09 08:00N 43°20' W 169°48'0 0.5 973.7 7.7
2016-Feb-09 07:00N 43°20' W 169°47'1 1.4 973.7 7.7
2016-Feb-09 06:00N 43°21' W 169°48'0 0.0 973.4 7.7
2016-Feb-09 05:00N 43°21' W 169°48'2 0.9 973.1 7.7
2016-Feb-09 03:00N 43°21' W 169°51'1 1.1 972.7 7.7
2016-Feb-09 02:00N 43°21' W 169°52'0 0.0 972.5 7.7
2016-Feb-09 01:00N 43°21' W 169°52'1 0.7 972.7 7.7
2016-Feb-08 23:00N 43°21' W 169°54'0 0.0 974.0 7.6
2016-Feb-08 22:00N 43°21' W 169°54'2 0.4 974.6 7.6
2016-Feb-08 18:00N 43°20' W 169°56'1 0.8 974.8 7.6
2016-Feb-08 17:00N 43°21' W 169°56'2 0.6 974.9 7.5
2016-Feb-08 13:00N 43°22' W 169°59'0 0.0 977.2 7.5
2016-Feb-08 12:00N 43°22' W 169°59'0 0.0 977.7 7.5
2016-Feb-08 09:00N 43°22' W 169°59'1 1.0 979.0 7.5
2016-Feb-08 08:00N 43°22' W 170°00'2 0.6 979.5 7.5
2016-Feb-08 05:00N 43°20' W 170°02'1 0.7 987.3 7.6
2016-Feb-08 04:00N 43°20' W 170°03'2 1.7 991.5 7.6
2016-Feb-08 03:00N 43°18' W 170°02'0 0.5 995.3 7.6
2016-Feb-08 02:00N 43°18' W 170°02'1 0.6 999.3 7.6
2016-Feb-08 00:00N 43°17' W 170°00'0 0.1 1006.1 7.6
2016-Feb-07 23:00N 43°17' W 170°00'1 0.6 1008.9 7.6
2016-Feb-07 21:00N 43°18' W 170°00'0 0.0 1011.2 7.7
2016-Feb-07 18:00N 43°18' W 170°00'0 0.2 1013.2 7.6
2016-Feb-07 17:00N 43°18' W 170°00'0 0.0 1013.0 7.6
2016-Feb-07 16:00N 43°18' W 170°00'1 1.3 1013.0 7.6
2016-Feb-07 15:00N 43°18' W 170°02'0 0.0 1013.2 7.6
2016-Feb-07 14:00N 43°18' W 170°02'1 0.2 1012.8 7.6
2016-Feb-07 08:00N 43°17' W 170°01'1 0.8 1012.4 7.5
2016-Feb-07 07:00N 43°17' W 169°60'1 1.0 1011.9 7.5
2016-Feb-07 06:00N 43°18' W 170°01'0 0.4 1011.7 7.5
2016-Feb-07 05:00N 43°18' W 170°00'1 0.3 1011.1 7.5
2016-Feb-07 03:00N 43°18' W 170°01'0 0.3 1010.0 7.6
2016-Feb-07 02:00N 43°18' W 170°01'0 0.2 1009.2 7.6
2016-Feb-07 01:00N 43°18' W 170°02'0 0.1 1008.7 7.6
2016-Feb-07 00:00N 43°18' W 170°02'2 1.6 1008.2 7.6
2016-Feb-06 23:00N 43°20' W 170°01'1 0.4 1008.2 7.6
2016-Feb-06 21:00N 43°20' W 170°02'1 0.5 1007.4 7.6
2016-Feb-06 19:00N 43°20' W 170°04'0 0.2 1006.2 7.6
2016-Feb-06 17:00N 43°19' W 170°04'0 0.4 1004.4 7.6
2016-Feb-06 16:00N 43°19' W 170°03'1 0.7 1003.7 7.6
2016-Feb-06 15:00N 43°20' W 170°03'0 0.0 1002.9 7.6
2016-Feb-06 14:00N 43°20' W 170°03'1 0.6 1002.5 7.6
2016-Feb-06 12:00N 43°20' W 170°05'0 0.0 1002.4 7.6
2016-Feb-06 10:00N 43°20' W 170°05'0 0.3 1002.1 7.6
2016-Feb-06 09:00N 43°20' W 170°05'0 0.0 1001.9 7.6
2016-Feb-06 08:00N 43°20' W 170°05'1 0.7 1001.5 7.6
2016-Feb-06 07:00N 43°21' W 170°06'2 1.1 1001.3 7.6
2016-Feb-06 05:00N 43°20' W 170°08'0 0.1 1000.1 7.6
2016-Feb-06 03:00N 43°20' W 170°08'1 0.7 999.1 7.6
2016-Feb-06 02:00N 43°20' W 170°09'0 0.1 998.7 7.6
2016-Feb-06 00:00N 43°20' W 170°09'0 0.3 998.5 7.6
2016-Feb-05 23:00N 43°20' W 170°09'1 0.3 998.3 7.6
2016-Feb-05 19:00N 43°21' W 170°08'0 0.0 997.0 7.5
2016-Feb-05 18:00N 43°21' W 170°08'1 0.9 996.6 7.4
2016-Feb-05 17:00N 43°21' W 170°09'0 0.4 996.3 7.4
2016-Feb-05 16:00N 43°21' W 170°09'1 0.7 996.0 7.4
2016-Feb-05 15:00N 43°21' W 170°10'1 0.2 995.6 7.3
2016-Feb-05 12:00N 43°21' W 170°11'1 0.2 995.1 7.2
2016-Feb-05 08:00N 43°20' W 170°11'0 0.3 995.2 7.3
2016-Feb-05 07:00N 43°20' W 170°11'0 0.1 996.2 7.3
2016-Feb-05 05:00N 43°20' W 170°11'1 0.8 998.7 7.3
2016-Feb-05 04:00N 43°20' W 170°13'1 0.4 999.6 7.3
2016-Feb-05 02:00N 43°19' W 170°13'0 0.0 1001.2 7.3
2016-Feb-05 00:00N 43°19' W 170°13'1 0.1 1003.5 7.3
2016-Feb-04 17:00N 43°18' W 170°13'0 0.4 1002.7 7.2
2016-Feb-04 16:00N 43°19' W 170°13'0 0.0 1002.2 7.2
2016-Feb-04 15:00N 43°19' W 170°13'0 0.0 1002.2 7.2
2016-Feb-04 14:00N 43°19' W 170°13'0 0.2 1002.3 7.2
2016-Feb-04 13:00N 43°19' W 170°13'0 0.0 1002.0 7.2
2016-Feb-04 12:00N 43°19' W 170°13'1 0.3 1001.9 7.2
2016-Feb-04 08:00N 43°18' W 170°15'0 0.1 1001.3 7.1
2016-Feb-04 07:00N 43°18' W 170°15'2 0.6 1000.5 7.1
2016-Feb-04 04:00N 43°18' W 170°17'1 0.1 999.8 7.1
2016-Feb-03 23:00N 43°18' W 170°17'2 0.3 998.3 7.1
2016-Feb-03 17:00N 43°20' W 170°18'2 0.5 995.8 7.1
2016-Feb-03 14:00N 43°20' W 170°20'1 0.2 995.7 7.1
2016-Feb-03 09:00N 43°19' W 170°21'1 0.9 994.5 7.1
2016-Feb-03 08:00N 43°19' W 170°20'1 0.3 994.4 7.1
2016-Feb-03 04:00N 43°20' W 170°19'2 0.6 990.8 7.1
2016-Feb-03 01:00N 43°20' W 170°22'1 0.4 993.9 7.1
2016-Feb-02 22:00N 43°19' W 170°21'1 1.0 999.6 7.1
2016-Feb-02 21:00N 43°18' W 170°21'0 0.0 1001.2 7.1
2016-Feb-02 20:00N 43°18' W 170°21'1 0.6 1002.7 7.1
2016-Feb-02 19:00N 43°18' W 170°20'0 0.0 1003.2 7.1
2016-Feb-02 17:00N 43°18' W 170°20'1 0.7 1005.2 7.1
2016-Feb-02 15:00N 43°19' W 170°19'0 0.0 1005.8 7.1
2016-Feb-02 14:00N 43°19' W 170°19'1 1.2 1006.0 7.1
2016-Feb-02 13:00N 43°20' W 170°21'0 0.1 1005.5 7.0
2016-Feb-02 09:00N 43°20' W 170°20'0 0.3 1005.0 7.0
2016-Feb-02 08:00N 43°20' W 170°21'1 0.5 1004.7 7.0
2016-Feb-02 07:00N 43°20' W 170°21'1 0.5 1004.6 7.0
2016-Feb-02 04:00N 43°20' W 170°22'1 0.4 1004.6 7.0
2016-Feb-02 01:00N 43°19' W 170°24'0 0.0 1003.4 6.9
2016-Feb-02 00:00N 43°19' W 170°24'2 0.2 1003.5 6.9
2016-Feb-01 15:00N 43°21' W 170°23'0 0.0 998.8 6.9
2016-Feb-01 14:00N 43°21' W 170°23'2 0.5 998.4 6.9
2016-Feb-01 10:00N 43°20' W 170°26'2 1.6 998.3 7.0
2016-Feb-01 09:00N 43°19' W 170°24'0 0.0 998.6 6.9
2016-Feb-01 08:00N 43°19' W 170°24'1 1.3 998.9 6.9
2016-Feb-01 07:00N 43°19' W 170°23'0 0.2 999.4 6.9
2016-Feb-01 05:00N 43°19' W 170°23'0 0.2 1001.0 6.9
2016-Feb-01 04:00N 43°19' W 170°22'1 0.6 1001.6 7.0
2016-Feb-01 03:00N 43°20' W 170°23'1 1.2 1001.9 7.0
2016-Feb-01 02:00N 43°21' W 170°24'2 0.6 1002.0 7.0
2016-Jan-31 23:00N 43°21' W 170°26'1 0.2 1005.1 7.0
2016-Jan-31 20:00N 43°20' W 170°27'1 0.6 1005.1 7.0
2016-Jan-31 18:00N 43°19' W 170°27'1 0.5 1004.6 6.9
2016-Jan-31 16:00N 43°20' W 170°27'0 0.0 1003.4 7.0
2016-Jan-31 15:00N 43°20' W 170°27'2 1.0 1003.0 7.0
2016-Jan-31 13:00N 43°22' W 170°27'1 0.1 1000.8 7.0
2016-Jan-31 08:00N 43°22' W 170°27'1 0.6 996.3 7.0
2016-Jan-31 07:00N 43°22' W 170°27'1 1.2 995.4 7.0
2016-Jan-31 06:00N 43°22' W 170°29'0 0.0 994.5 7.0
2016-Jan-31 05:00N 43°22' W 170°29'0 0.5 993.5 7.0
2016-Jan-31 04:00N 43°22' W 170°29'1 0.7 992.6 7.0
2016-Jan-31 03:00N 43°22' W 170°30'0 0.1 991.8 7.0
2016-Jan-31 01:00N 43°22' W 170°30'0 0.0 991.6 6.9
2016-Jan-31 00:00N 43°22' W 170°30'0 0.2 991.9 6.9
2016-Jan-30 23:00N 43°22' W 170°30'0 0.0 992.3 6.9
2016-Jan-30 22:00N 43°22' W 170°30'0 0.3 992.5 6.8
2016-Jan-30 21:00N 43°22' W 170°31'0 0.3 992.6 6.8
2016-Jan-30 20:00N 43°22' W 170°30'0 0.0 991.5 6.8
2016-Jan-30 19:00N 43°22' W 170°30'   992.0 6.8
Track history (hours):
 
Tides and Currents Weather Stations Pressure Air Temp Water Temp Dewpoint Dewpoint Depression Visibility Wind Speed Wind Dir Waves Ship Positions

Drifting buoy 46770

Last reported at 2016-Feb-09 17:00 UTC. Time now 2016-Feb-09 20:41 UTC.
Position N 43°17' W 169°45'.

Barometer 976.0 mb
Water temperature 7.6 ° C

Date/timePositionNaut miles runAvg speedWind from/ knotsBaromVisibWave heightAir tempDewpointWater temp
2016-Feb-09 17:00N 43°17' W 169°45'1 1.1 976.0 7.6
2016-Feb-09 16:00N 43°18' W 169°46'1 1.1 975.2 7.6
2016-Feb-09 15:00N 43°17' W 169°45'2 1.0 974.7 7.6
2016-Feb-09 13:00N 43°18' W 169°46'2 0.4 973.8 7.7
2016-Feb-09 08:00N 43°20' W 169°48'0 0.5 973.7 7.7
2016-Feb-09 07:00N 43°20' W 169°47'1 1.4 973.7 7.7
2016-Feb-09 06:00N 43°21' W 169°48'0 0.0 973.4 7.7
2016-Feb-09 05:00N 43°21' W 169°48'2 0.9 973.1 7.7
2016-Feb-09 03:00N 43°21' W 169°51'1 1.1 972.7 7.7
2016-Feb-09 02:00N 43°21' W 169°52'0 0.0 972.5 7.7
2016-Feb-09 01:00N 43°21' W 169°52'1 0.7 972.7 7.7
2016-Feb-08 23:00N 43°21' W 169°54'0 0.0 974.0 7.6
2016-Feb-08 22:00N 43°21' W 169°54'2 0.4 974.6 7.6
2016-Feb-08 18:00N 43°20' W 169°56'1 0.8 974.8 7.6
2016-Feb-08 17:00N 43°21' W 169°56'2 0.6 974.9 7.5
2016-Feb-08 13:00N 43°22' W 169°59'0 0.0 977.2 7.5
2016-Feb-08 12:00N 43°22' W 169°59'0 0.0 977.7 7.5
2016-Feb-08 09:00N 43°22' W 169°59'1 1.0 979.0 7.5
2016-Feb-08 08:00N 43°22' W 170°00'2 0.6 979.5 7.5
2016-Feb-08 05:00N 43°20' W 170°02'1 0.7 987.3 7.6
2016-Feb-08 04:00N 43°20' W 170°03'2 1.7 991.5 7.6
2016-Feb-08 03:00N 43°18' W 170°02'0 0.5 995.3 7.6
2016-Feb-08 02:00N 43°18' W 170°02'1 0.6 999.3 7.6
2016-Feb-08 00:00N 43°17' W 170°00'0 0.1 1006.1 7.6
2016-Feb-07 23:00N 43°17' W 170°00'1 0.6 1008.9 7.6
2016-Feb-07 21:00N 43°18' W 170°00'0 0.0 1011.2 7.7
2016-Feb-07 18:00N 43°18' W 170°00'0 0.2 1013.2 7.6
2016-Feb-07 17:00N 43°18' W 170°00'0 0.0 1013.0 7.6
2016-Feb-07 16:00N 43°18' W 170°00'1 1.3 1013.0 7.6
2016-Feb-07 15:00N 43°18' W 170°02'0 0.0 1013.2 7.6
2016-Feb-07 14:00N 43°18' W 170°02'1 0.2 1012.8 7.6
2016-Feb-07 08:00N 43°17' W 170°01'1 0.8 1012.4 7.5
2016-Feb-07 07:00N 43°17' W 169°60'1 1.0 1011.9 7.5
2016-Feb-07 06:00N 43°18' W 170°01'0 0.4 1011.7 7.5
2016-Feb-07 05:00N 43°18' W 170°00'1 0.3 1011.1 7.5
2016-Feb-07 03:00N 43°18' W 170°01'0 0.3 1010.0 7.6
2016-Feb-07 02:00N 43°18' W 170°01'0 0.2 1009.2 7.6
2016-Feb-07 01:00N 43°18' W 170°02'0 0.1 1008.7 7.6
2016-Feb-07 00:00N 43°18' W 170°02'2 1.6 1008.2 7.6
2016-Feb-06 23:00N 43°20' W 170°01'1 0.4 1008.2 7.6
2016-Feb-06 21:00N 43°20' W 170°02'1 0.5 1007.4 7.6
2016-Feb-06 19:00N 43°20' W 170°04'0 0.2 1006.2 7.6
2016-Feb-06 17:00N 43°19' W 170°04'0 0.4 1004.4 7.6
2016-Feb-06 16:00N 43°19' W 170°03'1 0.7 1003.7 7.6
2016-Feb-06 15:00N 43°20' W 170°03'0 0.0 1002.9 7.6
2016-Feb-06 14:00N 43°20' W 170°03'1 0.6 1002.5 7.6
2016-Feb-06 12:00N 43°20' W 170°05'0 0.0 1002.4 7.6
2016-Feb-06 10:00N 43°20' W 170°05'0 0.3 1002.1 7.6
2016-Feb-06 09:00N 43°20' W 170°05'0 0.0 1001.9 7.6
2016-Feb-06 08:00N 43°20' W 170°05'1 0.7 1001.5 7.6
2016-Feb-06 07:00N 43°21' W 170°06'2 1.1 1001.3 7.6
2016-Feb-06 05:00N 43°20' W 170°08'0 0.1 1000.1 7.6
2016-Feb-06 03:00N 43°20' W 170°08'1 0.7 999.1 7.6
2016-Feb-06 02:00N 43°20' W 170°09'0 0.1 998.7 7.6
2016-Feb-06 00:00N 43°20' W 170°09'0 0.3 998.5 7.6
2016-Feb-05 23:00N 43°20' W 170°09'1 0.3 998.3 7.6
2016-Feb-05 19:00N 43°21' W 170°08'0 0.0 997.0 7.5
2016-Feb-05 18:00N 43°21' W 170°08'1 0.9 996.6 7.4
2016-Feb-05 17:00N 43°21' W 170°09'0 0.4 996.3 7.4
2016-Feb-05 16:00N 43°21' W 170°09'1 0.7 996.0 7.4
2016-Feb-05 15:00N 43°21' W 170°10'1 0.2 995.6 7.3
2016-Feb-05 12:00N 43°21' W 170°11'1 0.2 995.1 7.2
2016-Feb-05 08:00N 43°20' W 170°11'0 0.3 995.2 7.3
2016-Feb-05 07:00N 43°20' W 170°11'0 0.1 996.2 7.3
2016-Feb-05 05:00N 43°20' W 170°11'1 0.8 998.7 7.3
2016-Feb-05 04:00N 43°20' W 170°13'1 0.4 999.6 7.3
2016-Feb-05 02:00N 43°19' W 170°13'0 0.0 1001.2 7.3
2016-Feb-05 00:00N 43°19' W 170°13'1 0.1 1003.5 7.3
2016-Feb-04 17:00N 43°18' W 170°13'0 0.4 1002.7 7.2
2016-Feb-04 16:00N 43°19' W 170°13'0 0.0 1002.2 7.2
2016-Feb-04 15:00N 43°19' W 170°13'0 0.0 1002.2 7.2
2016-Feb-04 14:00N 43°19' W 170°13'0 0.2 1002.3 7.2
2016-Feb-04 13:00N 43°19' W 170°13'0 0.0 1002.0 7.2
2016-Feb-04 12:00N 43°19' W 170°13'1 0.3 1001.9 7.2
2016-Feb-04 08:00N 43°18' W 170°15'0 0.1 1001.3 7.1
2016-Feb-04 07:00N 43°18' W 170°15'2 0.6 1000.5 7.1
2016-Feb-04 04:00N 43°18' W 170°17'1 0.1 999.8 7.1
2016-Feb-03 23:00N 43°18' W 170°17'2 0.3 998.3 7.1
2016-Feb-03 17:00N 43°20' W 170°18'2 0.5 995.8 7.1
2016-Feb-03 14:00N 43°20' W 170°20'1 0.2 995.7 7.1
2016-Feb-03 09:00N 43°19' W 170°21'1 0.9 994.5 7.1
2016-Feb-03 08:00N 43°19' W 170°20'1 0.3 994.4 7.1
2016-Feb-03 04:00N 43°20' W 170°19'2 0.6 990.8 7.1
2016-Feb-03 01:00N 43°20' W 170°22'1 0.4 993.9 7.1
2016-Feb-02 22:00N 43°19' W 170°21'1 1.0 999.6 7.1
2016-Feb-02 21:00N 43°18' W 170°21'0 0.0 1001.2 7.1
2016-Feb-02 20:00N 43°18' W 170°21'1 0.6 1002.7 7.1
2016-Feb-02 19:00N 43°18' W 170°20'0 0.0 1003.2 7.1
2016-Feb-02 17:00N 43°18' W 170°20'1 0.7 1005.2 7.1
2016-Feb-02 15:00N 43°19' W 170°19'0 0.0 1005.8 7.1
2016-Feb-02 14:00N 43°19' W 170°19'1 1.2 1006.0 7.1
2016-Feb-02 13:00N 43°20' W 170°21'0 0.1 1005.5 7.0
2016-Feb-02 09:00N 43°20' W 170°20'0 0.3 1005.0 7.0
2016-Feb-02 08:00N 43°20' W 170°21'1 0.5 1004.7 7.0
2016-Feb-02 07:00N 43°20' W 170°21'1 0.5 1004.6 7.0
2016-Feb-02 04:00N 43°20' W 170°22'1 0.4 1004.6 7.0
2016-Feb-02 01:00N 43°19' W 170°24'0 0.0 1003.4 6.9
2016-Feb-02 00:00N 43°19' W 170°24'2 0.2 1003.5 6.9
2016-Feb-01 15:00N 43°21' W 170°23'0 0.0 998.8 6.9
2016-Feb-01 14:00N 43°21' W 170°23'2 0.5 998.4 6.9
2016-Feb-01 10:00N 43°20' W 170°26'2 1.6 998.3 7.0
2016-Feb-01 09:00N 43°19' W 170°24'0 0.0 998.6 6.9
2016-Feb-01 08:00N 43°19' W 170°24'1 1.3 998.9 6.9
2016-Feb-01 07:00N 43°19' W 170°23'0 0.2 999.4 6.9
2016-Feb-01 05:00N 43°19' W 170°23'0 0.2 1001.0 6.9
2016-Feb-01 04:00N 43°19' W 170°22'1 0.6 1001.6 7.0
2016-Feb-01 03:00N 43°20' W 170°23'1 1.2 1001.9 7.0
2016-Feb-01 02:00N 43°21' W 170°24'2 0.6 1002.0 7.0
2016-Jan-31 23:00N 43°21' W 170°26'1 0.2 1005.1 7.0
2016-Jan-31 20:00N 43°20' W 170°27'1 0.6 1005.1 7.0
2016-Jan-31 18:00N 43°19' W 170°27'1 0.5 1004.6 6.9
2016-Jan-31 16:00N 43°20' W 170°27'0 0.0 1003.4 7.0
2016-Jan-31 15:00N 43°20' W 170°27'2 1.0 1003.0 7.0
2016-Jan-31 13:00N 43°22' W 170°27'1 0.1 1000.8 7.0
2016-Jan-31 08:00N 43°22' W 170°27'1 0.6 996.3 7.0
2016-Jan-31 07:00N 43°22' W 170°27'1 1.2 995.4 7.0
2016-Jan-31 06:00N 43°22' W 170°29'0 0.0 994.5 7.0
2016-Jan-31 05:00N 43°22' W 170°29'0 0.5 993.5 7.0
2016-Jan-31 04:00N 43°22' W 170°29'1 0.7 992.6 7.0
2016-Jan-31 03:00N 43°22' W 170°30'0 0.1 991.8 7.0
2016-Jan-31 01:00N 43°22' W 170°30'0 0.0 991.6 6.9
2016-Jan-31 00:00N 43°22' W 170°30'0 0.2 991.9 6.9
2016-Jan-30 23:00N 43°22' W 170°30'0 0.0 992.3 6.9
2016-Jan-30 22:00N 43°22' W 170°30'0 0.3 992.5 6.8
2016-Jan-30 21:00N 43°22' W 170°31'0 0.3 992.6 6.8
2016-Jan-30 20:00N 43°22' W 170°30'0 0.0 991.5 6.8
2016-Jan-30 19:00N 43°22' W 170°30'   992.0 6.8

Dump ship's entire track history