93 is the natural number following 92 and preceding 94. Natural number can mean either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). Natural numbers have two main purposes: they can be used for counting (there are 3 apples on the table), or they can be used for ordering (this is... 92 is the natural number following 91 and preceding 93. ... 94 is the natural number following 93 and preceding 95. ...

In linguistics, cardinal numbers is the name given to number words that are used for quantity (one, two, three), as opposed to ordinal numbers, words that are used for order (first, second, third). ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... This article is about the mathematical concept. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary or base-two numeral system is a system for representing numbers in which a radix of two is used; that is, each digit in a binary numeral may have either of two different values. ... In mathematics and computer science, hexadecimal or simply hex is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ...

In mathematics

Given 93 the Mertens function returns 0. In number theory, the Mertens function is where μ(k) is the Möbius function. ... 0 (zero) or nought is both a number and a numeral. ...

In science

• The atomic number of neptunium, an actinide.

In astronomy, The atomic number (Z) is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. ... General Name, Symbol, Number Neptunium, Np, 93 Chemical series Actinides Period, Block 7 , f Density, Hardness 20250 kg/m3, n/a Appearance Silvery metallic Atomic properties Atomic weight [237] u Atomic radius (calc. ... Astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and monitoring of transient phenomena. ...

Messier object M93, a magnitude 6.5 open cluster in the constellation Puppis

The New General Catalogue object NGC 93, a magnitude 13.3 spiral galaxy in the constellation Andromeda

The Saros number of the solar eclipse series which began on -29 August 9 and ended on 1287 October 8. The duration of Saros series 93 was 1316.2 years, and it contained 74 solar eclipses.

The Saros number of the lunar eclipse series which began on 291 May 30 and ended on 1571 July 7. The duration of Saros series 93 was 1280.1 years, and it contained 72 lunar eclipses.

Table of all 110 Messier objects. ... Open Cluster M93 (also known as Messier Object 93, Messier 93, M93, or NGC 2447) is an open cluster in the Puppis constellation. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... The Pleiades is one of the most famous open clusters. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Categories: Astronomy stubs | Modern constellations | Constellations | Puppis constellation | Argo Navis constellation ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... A spiral galaxy is a type of galaxy in the Hubble sequence which is characterized by the following physical properties: Spiral Galaxy M74 presents a face-on view of its spiral arms. ... Andromeda is a constellation named for the princess Andromeda (which is Greek for Ruler over men), a character in greek mythology. ... A Saros cycle is a period of 6585 + 1/3 days (approximately 18 years 10 days and 8 hours) which can be used to predict eclipses of the sun and the moon. ... Photo taken by John Walker during the Zambia 2001 eclipse A solar eclipse occurs when the Sun, Moon and Earth are on a single line with the Moon in the middle. ... August 9 is the 221st day of the year in the Gregorian Calendar (222nd in leap years), with 144 days remaining. ... Events December 14 -- Zuider Zee sea wall collapses, killing over 50,000 people End of the reign of Emperor Go-Uda of Japan Emperor Fushimi ascends to the throne of Japan The Theravada Buddhist kingdom at Pagan, Myanmar falls to the Mongols. ... October 8 is the 281st day of the year (282nd in leap years). ... An eclipse occurs whenever the Sun, Earth and Moon line up exactly. ... Events The War of the Eight Princes begins in China. ... May 30 is the 150th day of the year in the Gregorian calendar (151st in leap years). ... Events January 11 - Austrian nobility is granted Freedom of religion. ... July 7 is the 188th day of the year (189th in leap years) in the Gregorian Calendar, with 177 days remaining. ...

In other fields

Ninety-three is also:

• The designation of American Interstate 93, a freeway that runs from Massachusetts to Vermont.
• The code for international direct dial phone calls to Afghanistan.
• The number of United Airlines Flight 93, which crashed in Pennsylvania, USA on September 11, 2001.
• A greeting among Thelemites as 93 is the Numerological value of Thelema and Agape in Greek numerals.
• One of two ISBN Group Identifiers for books published in India.
• The code for the département of Seine-Saint-Denis in France, and as such used by many French gangsta rappers and those emulating their speech.
• The year AD 93, 93 BC, or 1993.