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Twilight
Twilight is the time between dawn and sunrise, and between sunset and dusk. Sunlight scattered in the upper atmosphere illuminates the lower atmosphere, and the surface of the earth is neither completely lit nor completely dark. The sun itself is not actually visible because it is below the horizon. Owing to the unusual quality of the ambient light at this time, twilight has long been popular with photographers and painters, who refer to it as the "blue hour", after the French expression l'heure bleue. Twilight is technically defined as the period before sunrise and after sunset during which there is natural light provided by the upper atmosphere, which receives direct sunlight and scatters part of it towards the earth's surface.

Dawn
Dawn is the time that marks the beginning of the twilight before sunrise. It is recognized by the presence of weak sunlight, while the sun itself is still below the horizon. Dawn should not be confused with sunrise, which is the moment when the leading edge of the sun itself appears above the horizon.

Morning

The word morning originally referred to the sunrise. Morning precedes midday, afternoon, and night in the sequence of a day. Morning is the part of the day usually reckoned from dawn to noon. The name (which comes from the Middle English word morwening) was formed from the analogy of evening using the word "morn" (in Middle English morwen), and originally meant the coming of the sunrise as evening meant the beginning of the close of the day. The Middle English morwen dropped over time and became morwe, then eventually morrow, which properly means "morning", but was soon used to refer to the following day (i.e., "tomorrow"), as in other Germanic languages—English is unique in restricting the word to the newer usage. The Spanish word "mañana" has two meanings in English: "morning," and "tomorrow."

Afternoon

Afternoon is the time of day from 12:00:01 p.m. (noon) to — depending upon context — evening, sunset, or 4:00 p.m.

The term should not be confused with "after noon" (two separate words), which is a translation of the Latin "post meridiem" (p.m.) as used in the12-hour clock, meaning a time of day from noon to midnight.

In Australia and New Zealand, the word "arvo" is a slang term for afternoon.

Noon

Noon (also mid-day or noon time) is defined as 12 o'clock in the daytime. The word noon is also used informally to mean midday, a time generally around the middle of the day when people in many countries take a lunch break. The scientific term solar noon describes the moment when the sun crosses the meridian in apparent solar time, the time when the sun is at its highest elevation in the sky. The time at which solar noon occurs depends on the longitude and date.^[1]

The opposite of noon is midnight.

Evening 
Evening is the period between the late afternoon and night when daylight is decreasing, around dinner time. Though the term is subjective, evening is typically understood to begin before sunset, during the close of the standard business day (about 4:00 pm) – and extend untilnightfall, the beginning of night. Evening thus spans the period of twilight, but begins before it and depending on definition may extend past its end.
Sunset

Sunset or sundown is the daily disappearance of the Sun below the horizon in the west as a result of Earth's rotation.

The time of sunset is defined in astronomy as the moment the trailing edge of the Sun's disk disappears below the horizon in the west. The ray path of light from the setting Sun is highly distorted near the horizon because of atmospheric refraction, making astronomical sunset occur when the Sun’s disk is already about one diameter below the horizon. Sunset is distinct from dusk, which is the moment at which darkness falls, which occurs when the Sun is approximately eighteen degrees below the horizon. The period between the astronomical sunset and dusk is called twilight.

Twilight
 is the time between dawn and sunrise, and between sunset and dusk. Sunlight scattered in the upper atmosphere illuminates the lower atmosphere, and the surface of the earth is neither completely lit nor completely dark. The sun itself is not actually visible because it is below the horizon. Owing to the unusual quality of the ambient light at this time, twilight has long been popular with photographers and painters, who refer to it as the "blue hour", after the French expression l'heure bleue^{[citation needed]}. Twilight is technically defined as the period before sunrise and after sunset during which there is natural light provided by the upper atmosphere, which receives direct sunlight and scatters part of it towards the earth's surface.

Dusk
Dusk is the beginning of darkness in the evening, and occurs after twilight, when the sky generally remains bright and blue. Civil dusk is when the center of the sun reaches 6° below the horizon. This marks the end of the evening civil twilight, the point where artificial illumination is required to read outside.^[1] It can be confused with sunset, which is the daily disappearance of the sun below the horizon.


Night

Night or nighttime is the period of time when the sun is below the horizon. The opposite of night is day (or "daytime" to distinguish it from "day" as used for a 24-hour period). The start and end times of night vary based on factors such as season, latitude, longitude and timezone.

At any given time, one side of the planet Earth is bathed in light from the Sun (the daytime) and the other side of the Earth is in the shadow caused by the Earth blocking the light of the sun. This shadow is what we call the darkness of night.

Midnight

Midnight is, in most systems, the transition time period from one day to the next: the moment when the date changes. In the Roman time system midnight was halfway between sunsetand sunrise, varying according to the seasons.

Solar midnight is that time opposite of solar noon, when the sun is closest to nadir and the night is equidistant from dusk and dawn. Due to the advent of time zones, which make time identical across a range of meridians, and daylight saving time, it rarely coincides with midnight on a clock. Solar midnight is dependent on longitude and time of the year rather than on a time zone.