# Intercalation

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**Spacetime**— For other uses of this term, see Spacetime (disambiguation). Two dimensional analogy of spacetime distortion. Matter changes the geometry of spacetime, this (curved) geometry being interpreted as gravity. White lines do not represent the… …112

**Theory of relativity**— This article is about the scientific concept. For philosophical or sociological theories about relativity, see Relativism. For the silent film, see The Einstein Theory of Relativity. Two dimensional projection of a three dimensional analogy of… …113

**Time zone**— Timezone and TimeZone redirect here. For other uses, see Time zone (disambiguation). Local time redirects here. For the mathematical concept, see Local time (mathematics). This article is about time zones in general. For a list of time zones by… …114

**Tropical year**— A tropical year (also known as a solar year), for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox,… …115

**Week**— For more details on each day of the week, see Weekday names. For the TV station in the Peoria Bloomington, Illinois market, see WEEK TV. Weeks redirects here. For other uses, see Weeks (disambiguation). A week is a time unit equal to seven days.… …116

**Paclitaxel**— Systematic (IUPAC) name (2α,4α,5β,7β,10β,13α) 4,10 bis(acetyloxy) …117

**Metric time**— is the measure of time interval using the metric system, which defines the second as the base unit of time, and multiple and submultiple units formed with metric prefixes, such as kiloseconds and milliseconds. It does not define the time of day,… …118

**Thalidomide**— This article is about the drug. For the musical about a person with thalidomide disability, see Thalidomide!! A Musical. Thalidomide Systematic (IUPAC) name (RS) 2 (2,6 dioxopiperidin 3 yl) 1H isoind …119

**Solar time**— On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …120

**Coordinated Universal Time**— UTC redirects here. For other uses, see UTC (disambiguation). Coordinated Universal Time (abbreviated UTC) is the primary time standard by which the world regulates clocks and time. It is one of several closely related successors to Greenwich… …