Aileen A. O Donoghue Priest Associate Professor of Physics
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1 SOAR: The Sky in Motion Life on the Tilted Teacup Ride Celestial Coordinates and the Day Aileen A. O Donoghue Priest Associate Professor of Physics
2 Reference Points Poles Equator Prime Meridian Greenwich, England Coordinates Latitude Longitude Where on Earth?
3 Coordinates Latitude Where on Earth? Measured N & S From Equator to Poles 0 to 90 N & S Longitude Measure E & W From Prime Meridian (0 ) to 180 E & W Canton, NY USA 44º 36 N, 75º 10 W Greenwich, England 50º 29 N, 0º 0 E Santiago, Chile 33º 36 S, 70º 40 W Cape Town, South Africa 33º 55 S, 18º 22 E
4 The Celestial Sphere The view from a small planet on the edge of the Orion arm of the Milky Way galaxy
5 Reference Points Celestial Equator Projection of Earth s equator NCP Celestial Poles Projections of Earth s poles Point of Aries Vernal Equinox Defines prime meridian (Celestial Greenwich) SCP
6 Celestial Coordinates Right Ascension RA or From prime meridian (0 h ) to 23 h 59 m 59 s Eastward NCP Declination Dec or From celestial equator (0º) to poles N & S 90º SCP
7 Celestial Coordinates Right Ascension Celestial Longitude Declination Celestial Latitude NCP Arcturus 14 h 15 m 39.3 s, 19º Vernal Equinox 0 h 0 m 0 s, 0º 0 0 Achernar (α Eri) 1 h 37 m 50.9 s, 57º SCP Rigel Kentarus (α Cen) 14 h 39 m 34.6 s, 60º 50 0
8 Celestial Coordinates Chet Raymo: 365 Starry Nights: October Earth observer in North America looking up at Great Square of Pegasus (an asterism) Wyoming has great skies! Degrees of Declination: Positive (N) 0 to +90 Negative (S) 0 to -90 Hours of Right Ascension 0 h to 24 h
9 Observers On Earth See different sky depending on Latitude Up is that way. Herauf ist so. Arriba es así. Ju ni huko.
10 Tilted Sky Observers see sky tilted due to latitude We see ourselves on top of the Earth, beneath the sky. So we see sky motions tilted To NCP Observer s Latitude Zenith NCP is at infinity so lines are parallel
11 Tilted Sky Fun with your mind Try to see yourself held to the bottom of Earth by gravity looking down at the sky!
12 Viewing the Sky Observers see celestial reference points at angles related to their latitude NCP to observer s zenith = observer s latitude to celestial equator SCP
13 Sky Angles = observer s latitude to observer s northern horizon to north celestial pole NCP to observer s zenith = observer s latitude Oh! I hate geometry! to celestial equator SCP
14 Earth Observer s View to north celestial = observer s pole latitude to observer s northern horizon = observer s latitude to observer s zenith to north celestial pole NCP to observer s zenith to celestial equator to observer s northern horizon to observer s to southern celestial horizon equator SCP Observer s Horizon
15 Altitude & Azimuth Position of an object in the sky Azimuth = Angle from north through east Altitude = Angle from horizon to object Antares is at azimuth 170º and altitude 30º Altitude North Azimuth South
16 Azimuth Angle from North through East North NE West East South 180
17 Horizon Coordinate System to north celestial pole to observer s zenith = observer s latitude to observer s northern horizon to celestial equator to observer s southern horizon
18 Horizon Coordinate System to north celestial pole to observer s zenith = observer s latitude to observer s northern horizon to celestial equator to observer s southern horizon
19 Question to observer s zenith to celestial equator to north celestial pole N S What s the observer s latitude? a) 70 N b) 20 N
20 Question to north celestial pole to observer s zenith to celestial equator N S What s the observer s latitude? a) 60 N b) 30 N
21 Diurnal Circles Each celestial object circles the observer each day Observer sees part of each circle Observer sees full diurnal circle Observer sees half of the diurnal circle Observer sees none of the diurnal circle
22 View of Observer Stars visible for 12 hours/day Stars ALWAYS visible Rotate into the observer s frame of reference Stars NEVER visible
23 View of Observers Diurnal circles are parallel to CE Stars rise and set at CE s angle from horizon Celestial Equator Stars rise parallel to celestial equator 90 - Stars set parallel to celestial equator
24 Star Paths Each travels a diurnal circle Portion of diurnal circle above horizon determines time object is up All paths parallel to celestial equator Vega up for 19 hours Summer sun up for 15 hours Antares up for 8 hours North South
25 Question Which observer(s) would see the star travel on the diurnal circle shown? a) b) North
26 Question Which observer(s) would see the star travel on the diurnal circle shown? a) b) North
27 Time of day Earth Rotates Once Each Day 360 with respect to Earth-Sun line All Earthlings ride along To Sol
28 Sunrise, Sunset Everything in the sky (sun, moon, stars, etc.) Rises in the east Sets in the west Measuring Circles: 360 = 24 hr 15 = 1 hr Each hour, the sun moves 15 degrees in the sky 1 = 4 min or each day 15 = 1 min Every 4 minutes, the sun moves 1 degree = 60 in the sky 0 0 hr 15 1 hr 30 2 hr 45 3 hr 60 4 hr 75 5 hr hr 90 6 hr hr 5 hr
29 Observer s View of the Day Sun rises in east, moves 15 /hour from East to West transits at noon sets in west
30 Standard Clock Time It s 6 pm Every Longitude at slightly (sunset). different time It s 9 pm. It s 3 pm. It s midnight. It s noon. It s 3 am. It s 9 am. It s 6 am (sunrise).
31 Clock Time = Position of Sol Observers move through times It s 9 pm. It s 6 pm (sunset). It s 3 pm. It s midnight. It s noon. It s 3 am. It s 9 am. It s 6 am (sunrise).
32 Daylight Saving Time It s 7 pm Shifts times one hour (sunset). later (USNO Explanation) It s 10 pm. It s 4 pm. It s 1 am. It s 1 pm. It s 4 am. It s 10 am. It s 7 am (sunrise).
33 Clock Time Time Zones: 24, roughly 15 apart 9 pm 6 pm 5 pm 4 pm 3 pm 2 pm 1 pm 12 am 12 pm 3 am 9 am 6 am
34 Time Zones Politics complicates things Prime Meridian Time Zone Center at 0 E Time Zone ~15 wide
35 North America Time Zones 120 W Pacific Time Zone 105 W Mountain Time Zone 90 W Central Time Zone 75 W Eastern Time Zone
36 Coordinated Universal Time UTC (UT or Zulu) Time at Greenwich no Daylight saving Conversion UTC = Standard Time on Prime Meridian EST (Eastern Standard Time) = UTC 5hr eg. 2pm (14:00) EST = 19:00 UT EDT (Eastern Daylight Time) = UTC 4hr eg. 2pm (14:00) EDT = 18:00 UT
37 Solar Time vs. Clock Time Solar time varies across time zones Sun s path seen from time zone center Time Zone s Solar Noon Clock Noon FOR ALL Eastern Observer s Solar Noon Western Observer s Solar Noon Rising East side Time Zone West side Setting
38 Solar Time vs. Clock Time Solar time varies across time zones Solar noon is (Degrees) (4 minutes/degree) earlier than clock noon Time Zone s Solar Noon Clock Noon FOR ALL Eastern Observer s Solar Noon Degrees East of TZ center Rising East side Time Zone West side
39 Question Portland, Maine, 70 W is in the Eastern Time Zone (center: 75 W). Solar noon occurs at (Degrees) (4 minutes/degree) = (5) x (4) = 20 minutes early Solar noon in Portland at 11:40 am Eastern Observer s Solar Noon Degrees East of TZ center East side Time Zone West side
40 Solar Time vs. Clock Time Solar time varies across time zones Time Zone s Solar Noon Clock Noon FOR ALL Solar noon is (Degrees) (4 minutes/degree) earlier than clock noon Solar noon is (Degrees) (4 minutes/degree) Later than clock noon Eastern Observer s Solar Noon Degrees East of TZ center Degrees West of TZ center Western Observer s Solar Noon Rising East side Time Zone West side Setting
41 Question Yuma, AZ, 115 W is in the Mountain Time Zone (center: 105 W). Solar noon occurs at a) 11:20 am, b) 11:40 am, c) 12:20 pm, d) 12:40 pm (Degrees) (4 minutes/degree) = (10) x (4) = 40 minutes late Eastern Observer s Solar Noon Degrees East of TZ center Degrees West of TZ center Western Observer s Solar Noon East side Time Zone West side
42 Celestial Navigation Finding Latitude & Longitude from Altitude of Polaris (NCP) Transit time of star Looked up in an ephemeris (eg. Field Guide) to observer s zenith to celestial equator to north celestial pole N Observer at 20 N S
43 Star Transit Time Gives position of star with respect to the sun eg. Look up transit time of Aldebaran on December 15 9 pm 6 pm 5 pm 4 pm 3 pm 2 pm Standard Time 11 pm Aldebaran s Position on 12 am 12/15 nearly opposite Sol! 1 pm 12 pm 3 am 9 am 6 am
44 Star Transit Time Gives position of star with respect to the sun eg. Look up transit time of Vega on July 15 (Daylight time) 10 9 pm 6 7 pm 5 6 pm 4 5 pm 3 4 pm 2 3 pm Standard Daylight Time Vega s Position on 7/15 nearly opposite Sol! 12 pm 12 1 am 2 1 pm 12 1 pm 3 4 am 10 9 am 6 7 am
45 Celestial Navigation Difference between observed and expected transit times gives longitude Observer watches star transit. Clock is set to some time zone. Observed transit time disagrees with ephemeris. Longitude difference from clock s time zone center = (Time difference) (15 /hour) Star s Transit Degrees East of TZ center Clock s Time Zone Longitude
46 Celestial Navigation Example: Transit of Deneb on August 1 Observer sees Deneb transit at 11 pm EDT Looks up transit time in FG On 8/1 Deneb transits at 1 am At 1 am Deneb will transit TZ center at 75 W Early East of TZ center Longitude difference from clock s time zone center = (2 hours) (15 /hour) = 30 East Observer s Longitude = TZ center Latitude difference = 75 W - 30 = 45 W
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