Billboard Hot 100

The Billboard Hot 100 is the music industry standard record chart in the United States for singles, published weekly by Billboard magazine. Chart rankings are based on radio play, online streaming, and sales (physical and digital).

The weekly sales period was originally Monday to Sunday when Nielsen started tracking sales in 1991, but since July 2015, this has been changed from Friday to Thursday. Radio airplay, which unlike sales figures and streaming data, is readily available on a real-time basis and is tracked on a Monday to Sunday cycle (it was previously Wednesday to Tuesday). A new chart is compiled and officially released to the public by Billboard on Tuesdays. Example:

Billboard 200

The Billboard 200 is a record chart ranking the 200 highest-ranking music albums and EPs in the United States, published weekly by Billboard magazine. It is frequently used to convey the popularity of an artist or groups of artists. Often, a recording act will be remembered by its "number ones", those of their albums that outperformed all others during at least one week.

The chart is based mostly on sales (both at retail and digitally) of albums in the United States. The weekly sales period was originally Monday to Sunday when Nielsen started tracking sales in 1991, but since July 2015, tracking week begins on Friday (to coincide with the Global Release Date of the music industry) and ends on Thursday. A new chart is published the following Tuesday with an issue post-dated to the Saturday of the following week. The chart's streaming schedule is also tracked from Friday to Thursday.

New product is released to the American market on Fridays. Digital downloads of albums are also included in Billboard 200 tabulation. Albums that are not licensed for retail sale in the United States (yet purchased in the U.S. as imports) are not eligible to chart. A long-standing policy which made titles that are sold exclusively by specific retail outlets (such as Walmart and Starbucks) ineligible for charting, was reversed on November 7, 2007, and took effect in the issue dated November 17.

The Billboard

The Billboard (77°4′S 145°40′W / 77.067°S 145.667°W / -77.067; -145.667Coordinates: 77°4′S 145°40′W / 77.067°S 145.667°W / -77.067; -145.667) is a massive granite monolith in the Sarnoff Mountains of the Ford Ranges of Marie Byrd Land, West Antarctica, standing just west of Mount Rea between Arthur Glacier and Boyd Glacier. It was discovered in November 1934 by a Second Byrd Antarctic Expedition (1933–35) sledge party under Paul Siple, and is so named because of its form and appearance with vertical faces rising above the continental ice.

The summit was first visited by helicopter in January 1993 during expedition GANOVEX VII. In 1998-99 a geological party from Colorado College reached the summit by climbing a west route.

Geology

It is topped by an erosion surface that reaches an elevation of 793 metres (2,602 ft), which is about 700 m above the outlet glacier below. The surface lacks glacial erosion features such as striae and whaleback forms; however erratics found on the surface provide evidence of overriding by cold-based glacier ice. Features characteristic of prolonged surface weathering in a sub aerial environment are sheeting and weathering pits.