Last year, Raspberry Pi teamed up with Trinket to launch a SenseHAT emulator. This emulator, which works in your browser, has now been updated. They’ve added the ability to mimic the movement sensors on-board a real SenseHAT. They’ve also added a 3D model of the Pi/HAT hardware so you can drag it around to change the sensor values.
Take a look at the emulator here and read more about the update here.