One of the best documentaries of Black History Month is also the best history of black art in America. Sam Pollard’s “Black Art: In the Absence of Light” (HBO, 9 p.m.) is framed by the groundbreaking work of art historian, curator, writer and teacher David Driskell, who died last April at 88. But it also provides a good showcase for such artists as Kerry James Marshall, Faith Ringgold, Theaster Gates and the celebrated portrait artists who made the official portraits of the Obamas, Kahinde Wiley and Amy Sherald. It’s both a comprehensive overview and a visual delight at a time when museums are still shuttered. (Here’s a story I did about the Obamas’ portrait unveilings; and a piece about a pair of Driskill exhibits a decade ago). 

Most Americans never get to witness an impeachment process in their lifetime; today you can see the second one in two years as the Impeachment Trial of Donald Trump (CSPAN, PBS, CNN, MSNBC, 1 p.m.) begins with oral arguments from both sides. 

A new “Frontline” (PBS, 10 p.m., check local listings) reports on Iranian-backed Shia militias terrorizing Iraq. 

Tony Shalhoub and Christopher Meloni hear about their families’ histories on “Finding Your Roots with Henry Louis Gates Jr.” (PBS, 8 p.m., check local listings). 

Three top planners compete against one another to create celebrity-style ceremonies on the new “My Celebrity Dream Wedding” (VH1, 9 p.m.).