Event: Tarzan could speak no English but yet he could read and write it. He had never seen a human being other than himself.
Source: "at eighteen," ERB-Tarzan Of The APES.
Event: Kala, Tarzan's ape foster mother, is killed by Kulonga.
Source: The actual date of Kala's death is not provided by ERB in Tarzan Of The Apes, but for Tarzan to be eighteen as reported the event had to occur after September 1, which is the ape man's birthday. To provide a working date I depended on the fact that ERB consistently tells us in many many passages throughout Tarzan Of The Apes and Jungle Tales Of Tarzan that Tarzan goes to Mbonga's village on the full moon to watch the natives dance and to replenish his arrows and other needs. Kulonga was out hunting for a catch for the full moon dance when he came upon Kala. Checking the U.S. Navel Observatory's Phases of the Moon we discover there was a full moon on September 28. Since Kulonga is hunting game for that upcoming event, and going by ERB's recorded description, it is most probable the day before the dance is when Tarzan's ape mother was killed.
Date: September 28, 1890
Event: Tarzan kills Kulonga and he discovers Mbonga's village.
Source: The day following Kala's death. ERB-Tarzan Of The Apes. ERB in Tarzan Of The Apes does not provide us with the actual date. As reported above ERB in many many passages throughout Tarzan Of The Apes and Jungle Tales Of Tarzan tells us that the ape man goes to Mbonga's village on the full moon to watch the natives dance and to replenish his arrows and other needs. ERB at this point does not explicitly say Tarzan watched the natives dance that night, but as one continues to read we discover that by Tarzan's third recorded visit to Mbonga's village, as reported in Jungle Tales Of Tarzan, that the ape man has already developed the love of watching the natives dance.
"Although he hated them, Tarzan derived considerable entertainment in watching them at their daily life within the village, and especially at their dances, when the fires, glared against their naked bodies as they leaped and turned and twisted in mimic warfare." ERB-Jungle Tales Of Tarzan.
Event: Tarzan finds his mother's locket, his father's diary, and a photograph of John Clayton.
Source: The day before setting out on his second recorded visit To Mbonga's village. ERB Tarzan Of The Apes. ERB does not provide the exact date but the clue is, the day before his second visit to Mbonga's village. Since we have established the fact that the natives dance on full moons this event occurs one day before a full moon.
Date: October 28, 1890 a full moon
Event: Tarzan's second trip to Mbonga's village was to steal arrows.
Source: "ere a month had passed" since his first visit." ERB-Tarzan Of The Apes. Although ERB does not mention native dancing we have now established that their dancing was one of Tarzan's favorite hobbies. Therefore, he always combined stealing arrows with dance nights. The reason ERB highlights the arrows in this case is because of Tarzan's archery practice.
The full moon date is from the U.S. Naval Observatory Astronomical Applications Department's Phases Of The Moon.
Date: October 29, 1890
Event: Tarzan Of The Apes fades out and Jungle Tales Of Tarzan begins.
Source: "That night he slept in the forest not far from the village, and early the next morning set out slowly on his homeward march," ERB-Tarzan Of The Apes.
Date: November 24, 1890
Event: Tarzan fights Taug for Teeka.
Source: The exact date is untold, but after Tarzan realizes Teeka is not for him Jungle Tales Of Tarzan chapter one states; :In Teeka he had seen within the past few hours a substitute for Kala - someone to fight and hunt for - someone to caress; but now his dream was shattered." ERB-Jungle Tales Of Tarzan.
This passage strongly suggest Tarzan's fight with Taug occurs very shortly after Kala's death. Not immediately, however, for when Tarzan goes to the village two days later ERB states, "It had been some time since Tarzan had visited the blacks and looked down from the shelter of the great trees which overhung their palisade upon the activities of his enemies, from among whom had come the slayer of Kala," ERB-Jungle Tales Of Tarzan.
Date: November 26, 1890 a full moon
Event: Tarzan watched Mbonga's warriors set a trap and followed them home in hopes of seeing them dance.
Source: Two days after his fight with Taug. ERB-Jungle Tales Of Tarzan.
Chat: This is Tarzan's third recorded visit to Mbonga's village and due to descriptions in other places it most likely was his third actual visit as well. One hint is that after Tarzan watched the black's build the trap ERB states, "Tarzan wondered what the thing might be, and why, when they had built it, they turned away and started back along the trail in the direction of their village." ERB-Jungle Tales Of Tarzan.
From this we can gather Tarzan is looking at his first trap which proves he has little experience with the blacks. Up to this point we are told Tarzan goes once a month, man time, or once a moon, ape time, to replenish his arrows. It is specifically stated this visit is to watch the blacks dance; but the passage quoted above, "it had been some time since Tarzan had visited the blacks," suggest that stealing arrows is most likely on the agenda also. ERB-Jungle Tales Of Tarzan.
The full moon date is provided by U.S. Naval Observatory Astronomical Applications Department's Phases Of The Moon.
Date: November 27, 1890
Event: Tarzan discovers Taug in the native's trap and rescues him.
Source: "Early the following morning." ERB-Jungle Tales Of Tarzan.
Date: November 28, 1890
Event: Tarzan rescues Tantor, but is captured by the blacks. He is taken to Mbonga's village which is his fourth recorded visit.
Source: Again ERB offers no date, but again Tarzan's ignorance of the trap shows the small passage of time. "Puzzle as he would, however, he could not solve the mystery of the concealed pit, for the ways of the blacks were still strange ways to Tarzan. They had entered his jungle but a short time before - the first of their kind to encrouch upon the age-old supremacy of the beasts which laired there." ERB-Jungle Tales Of Tarzan
Date: December 26, 1890
Event: Tarzan pays an unrecorded visit to Mbonga's village to watch the native's dance and to steal arrows.
Source: Although this date is not directly provided by ERB, it is based on ERB's provided information that Tarzan goes once a month to Mbonga's village on a full moon to watch them dance and to steal supplies. The full moon date is supplied by U.S. Naval Observatory Astronomical Applications Department's Phases Of The Moon.