A

• Akan calendarCalendar used by the Akan people, a Kwa group of West Africa
• Anno MundiCalendar era based on the biblical account of creation
• Armenian calendarThe Armenian calendar is the calendar traditionally used in Armenia, primarily during the
• Atomic clockClock that monitors the resonant frequency of atoms
• Automotive navigation systemPart of the automobile controls
• Aztec calendarCalendar system that was used by the Aztecs

B

• Babylonian calendarLunisolar calendar
• Balance wheelTime measuring device

C

• CalendarSystem for organizing days
• Celestial navigationNavigation using astronomical objects to determine position
• Chinese calendarLunisolar calendar
• Chinese ceramicsPottery and porcelain from China
• ClockInstrument for measuring, keeping or indicating time
• CompassInstrument used for navigation and orientation
• Coordinated Universal TimePrimary time standard globally used to regulate clocks and time

D

• Daylight saving timeSeasonal change of clock settings
• Dead reckoningMeans of calculating position

E

• EdictAnnouncement of a law, often associated with monarchism
• Era of the MartyrsCalendar era used by Alexandrian churches
• Ethiopian calendarPrincipal calendar used in Ethiopia and Eritrea

F

• Fire HorseForty-third element of the sexagenary cycle
• Four Great InventionsCanonical landmark inventions in China
• French frigate La Motte-PicquetLa Motte-Picquet was a F70 type anti-submarine frigate of the French Navy. She was the fou
• FutureTime after the present

G

• Global Positioning SystemAmerican satellite-based radio navigation service
• Gregorian calendarInternationally accepted civil calendar
• Guatemalan HighlandsThe Guatemalan Highlands is an upland region in southern Guatemala which lies between the
• GyroscopeDevice for measuring or maintaining orientation

H

• HaabʼPart of the Maya calendric system
• HanluSeventeenth solar term of traditional East Asian calendars
• Hijri eraEra in the Islamic calendar
• History of metallurgy in ChinaMetallurgy in China has a long history, with the earliest metal objects in China dating ba
• Hyperbolic navigationHyperbolic navigation is a class of radio navigation systems in which a navigation receive

I

• Islamic calendarLunar calendar used by most Muslims
• ISO week dateLeap week calendar system

J

• Japanese calendarCalendars used in Japan past and present
• Julian calendarSolar calendar

K

• Kali aharganaInteger associated with a civil day
• Korean calendarTraditional calendar
• Kremlin ClockThe Kremlin Clock (Russian: Кремлёвские часы, romanized: Kremlyovskiye chasy) or Kremlin C

L

• Leap yearCalendar year with a day (or month) added
• Lunar distance (navigation)Angular distance between the Moon and another celestial body

M

• Magnetic declinationAngle on the horizontal plane between magnetic north and true north
• MainspringSpring used as clockwork power source
• MapSymbolic depiction of spatial relationships
• Maya calendarCalendar used in pre-Columbian Mesoamerica
• Meshir6th month of the Coptic calendar
• Mesoamerican Long Count calendarCalendar used by Mesoamerican cultures
• Missing years (Jewish calendar)The missing years in the Hebrew calendar refer to a chronological discrepancy between the

N

• NavigationProcess of monitoring and controlling the movement of a craft or vehicle
• NityayogaPeriod of time in Indian astronomy

O

• October (Roman month)Eighth month in the Roman calendar

P

• PastEvents that occurred before a given time point
• Pawukon calendar210-day calendar from Bali, Indonesia
• PendulumMechanism for regulating the speed of clocks
• Polar wanderPolar wander is the motion of a pole in relation to some reference frame. It can be used,

Q

• QiufenSixteenth solar term of traditional East Asian calendars

R

• Rabi IIFourth month of the Islamic calendar
• RadarObject detection system using radio waves
• Radio clockClock which synchronizes its time using radio transmitters
• RadiodeterminationAs defined by FS-1037C and ITU Radio Regulations, radiodetermination is:
• Republic of China calendarCalendar used in Taiwan

S

• SamvatsaraSanskrit term for a year
• Satellite navigationUse of satellite signals for navigation or geo-spatial positioning
• Science and technology of the Song dynastyAspect of Chinese history
• Seleucid eraCalendar era used during Hellenistic period
• September 23 (Eastern Orthodox liturgics)September 22 - Eastern Orthodox liturgical calendar - September 24
• SextantTool for angle measurement
• SodarSodar, an acronym of sonic detection and ranging, is a meteorological instrument used as a
• Solar Hijri calendarOfficial calendar of Iran
• SonarAcoustic sensing method
• Striking clockClock that sounds the time with a bell or gong
• SundialTime-telling device

T

• Thout 22Thout 21 – Coptic calendar – Thout 23
• Thout 26Thout 25 – Coptic calendar – Thout 27
• Tibetan calendarTibetan Lunisolar calendar
• Time zoneArea that observes a uniform standard time
• Tishrei7th month of the Hebrew calendar
• Tusculum portraitRoman bust, only extant portrait of Julius Caesar made during his lifetime
• Tzolkʼin260-day calendar used by the pre-Columbian Maya civilization

V

• VendémiaireFirst month of the French Republican calendar

W

• WatchPersonal timepiece

Z

• Zeiss SonnarThe Zeiss Sonnar is a photographic lens originally designed by Dr. Ludwig Bertele in 1929