Some thoughts
While reading these Haikus, one thing appears is, how available to the Japanese mindset or mental landscape are the year and each of its days marked with natural beauty or some past historic legend, from flowers of different seasons to the phases of moon. It seems a whole mental treasure trove or a fabric of memory and recall available which is not cultivated as beautifully in other cultures. Be it flower viewing, autumn appreciating or moon viewing. And the legends associated with different days and different months - sort of add a different depth to their literature and poetry. A bigger sandbox for a poet to play with.
Personally, I feel one can map memory to years, month, days and to the places one has lived and been in. And zoom in and out of there. And then to the known atlas, geography of the world and planets. But this shared calendar with a whole culture lends a currency or a language which allows for better exchange of mental states. And then even a small haiku can be as loaded as a long ballad, by recalling just the keyword of the legend or the day.
From
The book - Basho | The complete Haiku of Matsuo Basho.
The book provides context to each Haiku which beautifully enriches the poems. Here I have copied only the Haikus.