Kobukan Dojo

04/18/2026

https://drive.google.com/file/d/14ozMpewzd79nMXhGjYaGkNjRZeZ7VGr3/view?t=176.945

10/12/2025

A Map of the Northern Magnetic Pole's Shift Over 400 Years:

Earth's magnetic poles are undergoing dramatic change — and the pace of change is accelerating.

The North Magnetic Pole, the point where Earth's geomagnetic field is vertical, has been steadily shifting for centuries. A historical mapping of its movement from 1640 to 2020 reveals a gradual northwest trajectory in more recent centuries, primarily toward Siberia.

This shift has significantly accelerated in the past century, with the pole rapidly approaching Russia.

The movement is influenced by changes in the dynamics of Earth's molten iron core, which generates the planet's magnetic field. Unlike fixed geographical poles, the North Magnetic Pole's position fluctuates daily within an oval-shaped locus due to geomagnetic variations.

To create maps like these, scientists use historical data from magnetic measurements taken at various locations over centuries, including records from old compass readings, volcanic rock samples, and recent satellite observations.

Image: Nature

12/02/2021

Onigote kata practice

10/14/2021

Some highlights from practice this Tuesday evening. Do-uchi seemed to be the theme. We learned that Trevor has a lightning-fast do-uch. Aaron finally hit hit a reasonable do-uchi or two.

06/09/2021

Warriors never die, they become a hue of the sword.

Our heart goes out to the students of Ōtake Risuke Sensei, guardian and teacher of the Tenshin Shōden Katori Shintō ryū.

It goes without saying that his model as a teacher and martial artist has deeply inspired all of us who follow a true path in Budō, regardless of discipline or tradition.

We are thankful that the many students of this cultural treasure will continue on preserving his work, and his spirit will illuminate for generations to come.

05/29/2021

Just released a new video about iaido basic fundamentals. We are pleased to be opening our doors to new students again.

After receiving our vaccinations we’re back to practicing in the dojo. However even during it’s apex the pandemic did not effect our ability to practice iaid...

01/28/2021

https://youtu.be/2iHE_pJo8pE

2020 has been an interesting year to say the least and has taken a toll on many people. Luckily our martial studies have been integral in remaining active an...

11/23/2020

Zoom practice Tuesday night Nov 24, starting at 6:30pm Denver Time.

11/05/2020

In kyudo, there is a concept called the “8 Phases of Shooting”. This concept divides the movement for releasing the arrow into 8 phases; each phase has its own name. The last phase that brings the …