I piqued my own interest and went and found that old post. Lets see if we can piece together the old calendar of the Cath Bruig.
Firstly, the calendar is a nine-moon, or 260-day cycle, called the tzolkin. The tzolkin is dividing into periods of 20 days. They aren't named and numbered like our own months and days, though. There are 20 symbols - Crocodile, Wind, Temple, and so on - and they are numbered in by the 13s (13 times 20 equals 260). So a procession of days over two 20-day cycles would look like this:
1 Crocodile, 2 Wind, 3 Temple, 4 Lizard, 5 Skull, 6 Rabbit, 7 Water, 8 Dog, 9 Monkey, 10 Grass, 11 Reed, 12 Jaguar, 13, Eagle, 1 Vulture, 2 Flint, 3 Storm, 4 Flower, 5 Crocodile, 6 Wind, 7 Temple, 8 Lizard, 9 Skull, 10 Rabbit, 11 Water, 12 Dog, 13 Monkey, 1 Grass, 2 Reed, 3 Jaguar, 4 Eagle, 5 Vulture, 6 Flint, 7 Storm, 8 Flower
As you can see, every 20-day cycle, each symbol's corresponding number rises by four (and loops over when it passes 13; so 10 becomes 1, 11 becomes 2, etc). Trace this forward throughout the cycle and you see the next time Crocodile is 1 is at the start of the next cycle.
(A quick note: no, the Mayans didn't belive that the year was 260 days long, they had calculated it to 365.2422 back when Europeans still had no concept of leap years. The tzolkin is their sacred calendar, because 260 days is the human gestation period and the common factor in the cycles of the sun, Mercury, Venus, Earth, moon, Mars, and other planets. Eerie, isn't it? Anyway, they also have a solar calendar called the haab, which works somewhat like our own).
Now, on to the symbols. I'll use excepts from The Crimson King's post on the Mayan calendar, and then equate them to the symbols at Jenkin's page (http://www.resonate.org/places/writings/mayan/jenkins1.htm) and the symbols in the Heron names.
"The crocodile or alligator represents the water serpent which is part of the Mayan creation story. It is the first day of the 20-day cycle, and it symbolizes creation. The day in life is probably conception or perhaps the creation of the spirit before birth. The Mayan name "Imix" devives from Ix, meaning 'womb.'"
This, obviously, corresponds to the Crocodile symbol in Heron names, and the Alligator on Jenkin's page.
"The wind symbolizes the spirit, and this day represents the day of quickening, on which the spirit enters the fetus in the womb."
Wind is Wind is Wind, but the Jeweled Fan may also fit in here since it is something that makes wind.
"This glyph is usually translated 'house,' but it is a picture of a temple, and a temple is a holy house. It represents the house of the spirt, or the body. In the cycle of life, it is the day of birth, when the spirit receives it's house."
Jenkins calls this "House", but no Heron names we know of seem to use it. Perhaps "Stone", being a thing used to build houses, could fit in here, but it's a stretch. It's also used to make knives, and so would fit under that symbol as well.
"The lizard represents evil, and this day represents the day on which evil enters a childs life. Before that age, it was believed a child was pure and could not be tempted."
Obviously Lizard (here) is Lizard (Jenkins) is Lizard (Herons). However, it would also appear that the Heron symbol "Devil" could be translated from this. There is also a "Lizard Tongue" symbol used by the Herons, which I would group in here.
"The serpent apparently represents all of mortality, or at least all of adulthood. It was said to be the day when man 'gathers together all the experience of life.' The three days of Temple, Lizard and Serpent thus may each represent the beginning day of the three periods of life of childhood, adolescence and adulthood."
Serpent is Serpent is Serpent, but the Herons also use a "Serpent Seeking Shadow" symbol, which may be grouped in with this.
"The skull represents death, and the day is the day of death."
Jenkins calls this "Death", appropriately, and the Herons use the Skull symbol.
"The deer apparently represents entrance into the spirit world, perhaps the day being that of the fleeting life review which occurs there shortly after arrival in the spirit world."
Both Jenkins and the Herons use the Deer symbol, but nothing else seems to correspond to it.
"The rabbit represented the 'struggle to overcome the material state.' Apparently it was believed that even as a spirit, after death one is still attached to physical things."
Rabbit is used by the Herons and by Jenkins, and perhaps the Heron symbol "Pride" would fit in here.
"Water represented the day on which one 'reaps the reward of his effort' of overcoming materialism. Many ancient religions had the goal of controlling phyical desires."
Water is Water is Water.
"At the lowest point of the circle, the dog (a guide through the underworld) represents the day one 'enters fully into the uttermost depths of matter.'"
Dog is Dog is Dog, as well as the Heron symbol "Coyote" (a type of dog). The Herons also have a symbol, "Star", which is used only once inconjunction with "Dog". The Dog Star, in Earth astonomy, is Sirius, the brighests star in the sky and part of the "Orion's dog" (I forget the Latin name) constallation. So I would group Dog Star in here.
"The monkey represents the day when one 'burns without flame.' It apparently is apurging or cleansing by fire."
Jenkins also calls this Monkey, but the Herons have both Monkey and Fire symbols. Perhaps the Herons' "Burning Stone" symbol would fit in here as well.
"The figure is of grass growing out of a skull, representing life coming from death. The Mayan priest was more vague on this and the remaining steps, saying only that on this day one 'begins to climb the ladder' of progression."
Jenkins calls this Grass, but the Herons don't seem to use it.
"The reed is a continuation of the grass growing from the skull. The priest said only that it is another rung on the ladder. Because it is opposite on the circle from the day representing birth, it may represent resurrection, the day when the body and spirit are reunited."
Jenkins and the Herons call this Reed. The Heron symbol "Heron" may also fit here, seeing as the Egyptians viewed the Heron as the Phoenix, which we all know is a symbol of life from death.
"The jaguar represented the day on which one is "washed entirely clean," apparently referring to baptism. It is also known that the jaguar symbolized an order of priesthood, apparently the one associated with baptism."
Both Jenkins and the Herons use the Jaguar symbol, but the Herons also have a Jaguar Claw that may fit in here.
"The eagle represents the day on which one 'becomes perfect.' It also symbolized a higher priesthood order than the Jaguar. It is opposite the serpent in the circle."
Eagle is Eagle is Eagle, and no other symbol seems to fit in here.
"Most tribes saw this figure as a vulture, but originally it was probably a condor (in the vulture family), known also as the thunderbird and revered as the only bird which flies higher than the eagle. On this day one received the 'full light of consciousness.'"
The Herons call this "Vulture", while Jenkins translates it as "Owl".
"This glyph symbolizes both earthquake and motion in general. It is the day when one 'shakes of the last traces of ash clinging to him from the material world.'"
Jenkins calls this "Quake", and the Herons use the term "Motion".
"The flint knife represented sacrifice, which is another required step."
Jenkins calls this simply "Knife". I group the Heron symbol "Obsidion" in here as well, as that is used much like flint to make knives.
"The storm, or rain of fire, is the day when ones 'divine nature is manifest.'"
Jenkins calls this "Rain", and the herons also have a "Rain" symbol. Perhaps the Heron symbol "Falling Sun" also fits in here, as a "rain of fire" could easily be interpreted as a falling sun.
"Flower is the day when one 'becomes one with divinity.' This symbolism is similar to the lotus flower in Hinduism. The Mayan name Ahau for this glyph means 'Lord.'"
The Herons have a "White Flower" symbol, the Lotus. Jenkins calls this the Flower.
So a chart of the symbols would seem to go:
1. Crocodile, Alligator
2. Wind, Jewelled Fan (?)
3. House, Temple
4. Lizard, Lizard Tongue (?), Devil
5. Serpent, Serpent Seeking Shadow (?)
6. Death, Skull,
7. Deer
8. Rabbit, Pride (?)
9. Water
10. Dog, Dog Star (?), Coyote
11. Monkey, Fire, Burning Stone (?)
12. Grass
13. Reed, Heron (?)
14. Jaguar, Jaguar Claw (?)
15. Eagle
16. Vulture, Owl
17. Quake, Motion
18. Flint, Knife, Obsidian
19. Rain, Storm, Falling Sun (?)
20. Flower, White Flower
There are still seven (yes, seven!) symbols that don't seem to fit. They are Sun Collar, Bloody Sun, Waiting Cactus, Drum, Moon, Green Talon, and Bloody Stone.
Interesting to note that Heron symbol quite possibly falls on 13, which is one of the cyclical numbers of the tzolkin.
Also interesting to note that the Maya have a longer timekeeping method called the "Long Count", which cumulates in a 5125-year period called the Great Cycle! In the Mythworld, if year 0 of the Great Cycle (on the old Heron calendar) is the start of the First Era, then we are only 1013 years from the end of the Great Cycle! However, if it started a thousand years BEFORE the First Era (in the Zeroth Era, maybe?), then it's only 13 (!) years away, in 2555 AE - exactly 125 years, 1/8 of an Era, into the Sword Age.
(Interestingly enough, in the real world, the Mayan Great Cycle is ending in 2012, Real Soon Now. Not to mention the alignment of the SEVEN inner planets this May, and the major solar flares coming up. Apocalypse now!).
