Comic Title: Adventure Comics #413
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: December 1971
On Sale Date: October 28, 1971 Newsstand Date October 28, 1971
Source: House Ad, World's Finest Comics #208, Page 37

Newsstand Date October 28, 1971
Source: Etcetera, V1 #8

Copyright Date October 28, 1971
Source: Library of Congress, Periodicals 1971

Frequency: Monthly (semi-monthly, March)
Cover Price: $0.25
Page Count: 48
Editor: Joe Orlando

Title: "Earth's Impossible Day"
Pages: 12

Feature(s):
Hawkman (of Earth-1)

Writer: Gardner F. Fox
Artist: Joe Kubert

Reprinted From:
Brave and the Bold #44 (1962)

Feature Character(s)

• Hawkman (last appearance in Brave and the Bold #43; next appearance in Brave and the Bold #44)

Supporting Character(s)

• Hawkgirl (last appearance in Brave and the Bold #43; next appearance in Brave and the Bold #44)
• George Emmett (last appearance in Brave and the Bold #43; next appearance in Mystery in Space #88)
• Mavis Trent (last appearance in Brave and the Bold #43; next appearance in Mystery in Space #88)
• Big Red (a hawk ally of Hawkman and Hawkgirl; next appearance in Hawkman #5)

Villain(s)

• Tommy-Gun Tyler and Genius Joe (two convicts; no further appearances)
• Marty Stone (a thief; no further appearances)

Other Character(s)

• Two unnamed forest fire fighters (no further appearances)
• Prison guards (no further appearances)

Synopsis:
Earth’s Fourth of July coincides with a Thanagarian tradition called "Impossible Day," in which citizens perform three impossible feats to honor their mutual ancestor, Rhon Dhu. As Hawkman and Hawkgirl, Katar and Shayera go on a traditional picnic and help out a forest fire by causing it to "rain upwards"; they then capture a band of crooks protected by an electrical force field by throwing lightning at them (in the form of lightning-born fulgarite boulders). Finally, they recover stolen museum relics, despite the thief firing invisible bullets at them, and thus, they fulfill their Thanagarian tradition by performing three "impossible" feats.