A lunar calendar is a calendar that is based on cycles of the lunar phase. A common purely lunar calendar is the Islamic calendar or Hijri Qamari calendar. A feature of the Islamic calendar is that a year is always 12 months, so the months are not linked with the seasons and drift each solar year by 11 to 12 days. It comes back to the position it had in relation to the solar year approximately every 33 Islamic years. It is used mainly for religious purposes, and in Saudi Arabia it is also used for commercial purposes. Because there are about twelve lunations (synodic months) in a solar year, this period (354.37 days) is sometimes referred to as a lunar year. The Hebrew calendar also uses a fixed ratio (12+7/19) so it will eventually drift, such that Passover would be in autumn.

Most lunar calendars are in fact lunisolar calendars. That is, months reflect the lunar cycle, but then intercalary months (e.g. "second Adar" in the Hebrew calendar) are added to bring the calendar year into synchronisation with the solar year. Some examples are the Chinese and Hindu calendars, and most calendar systems used in antiquity.

Zakir Abdul Karim Naik (Urdu: ذاکر عبدالکریم نائیک; born 18 October 1965) is an Indian public speaker on the subject of Islam and comparative religion. He is the founder and president of the Islamic Research Foundation (IRF), a non-profit organisation that owns the Peace TV channel based in Dubai, UAE. He is sometimes referred to as a televangelist. Before becoming a public speaker, he trained as a doctor. He has written two booklets on Islam and comparative religion. He is regarded as an exponent of the Salafi ideology; he places a strong emphasis on individual scholarship and the rejection of "blind Taqlid", which has led him to repudiate the relevance of sectarian or Madh'hab designations, all the while reaffirming their importance.

Zakir Abdul Karim Naik was born on 18 October 1965 in Mumbai, India. He attended St. Peter's High School in Mumbai. Later he enrolled at Kishinchand Chellaram College, before studying medicine at Topiwala National Medical College and Nair Hospital and later the University of Mumbai, where he obtained a Bachelor of Medicine and Surgery (MBBS). His wife, Farhat Naik, works for the women's section of the IRF.

Thomas Matthew "Tom" DeLonge, Jr. (born December 13, 1975) is an American rock musician. He is the guitarist and one of the two lead vocalists for the American pop punk band blink-182 as well as the guitarist and lead vocalist for the alternative band Angels & Airwaves. He was also the guitarist and lead vocalist for the alternative band Box Car Racer.

Raised in Poway, California, DeLonge developed an interest in punk rock during his teens. Tom was voted Homecoming King at the Poway High School dance when he didn't attend the school anymore, after being expelled from Poway High School for drinking at a basketball game. He then attended Rancho Bernardo High School where he met Anne Hoppus. Anne Hoppus introduced him to her brother, Mark Hoppus, who also shared an interest in music. Tom also introduced Mark to Scott Raynor. The three formed blink-182 which became one of the most popular rock groups of the 1990s–2000s. Travis Barker replaced Scott in later years. The group underwent an indefinite hiatus in 2005, with DeLonge focusing more on his Angels & Airwaves project. blink-182 reformed in 2009, and released a new album in September 2011.