Consider the following.
July 20, 1869: The Transcontinental Railroad has been complete for 70 days.
July 20, 1919: The U.S. Army convoy taking the Lincoln Highway across the United States, “the largest aggregation of motor vehicles ever started on a trip of such length,” spends a Sunday rest day in Chicago. Over the next week it would pass through Iowa. The journey would take two months.
July 20, 1969:
January 20, 1982: It’s one-eighth of a century since the moon landing. About seven months before this date, MTV debuted using astronaut imagery. About a year after this date, the Apple IIe will be introduced and Time will name the computer “Machine of the Year”.
July 20, 1994: The space shuttle Columbia is on a mission above Earth. The first Power Macs are a few months old. Eleven weeks from now, the beta version of Netscape will be released, but you can already buy the first edition of The Internet Yellow Pages … in a book store, because Amazon.com won’t go live until almost exactly a year later.
January 20, 2007: Apple announced the iPhone 11 days ago.