Since the demise of Adobe Flash (2005-2020), the NAAP applets can no longer be embedded in HTML and using them some other way with Introductory Astronomy Lectures (IAL) seems too awkward to contemplate. So I'm just saving on the inserts here and leave comments in the IALs as to where they were so they can be restored should that ever seem feasible.

- naap_blackbody.html:
In IALs,
find the comment ! Insert--naap_equatorial_horizontal.html------------------------------------------------>
The applet in the figure below (local link / general link: naap_blackbody.html) dynamically illustrates the blackbody spectrum.

- naap_equatorial_horizontal.html:
In IALs,
find the comment ! Insert--naap_equatorial_horizontal.html------------------------------------------------>
**An Applet Dynamically Illustrating the Relationship Between the Horizontal Coordinate System and the Equatorial Coordinate System:**The applet in the figure below (local link / general link: naap_equatorial_horizontal.html) dynamically illustrating the relationship between the horizontal coordinate system and the equatorial coordinate system.

- naap_exoplanet_transit_simulator.html
- naap_hr_diagram.html:
In IALs,
find the comment ! Insert--naap_hr_diagram.html------------------------------------------------>
**An HR Diagram Applet:**One can gain more insight into the HR diagram by exploring the applet in the figure below (local link / general link: naap_hr_diagram.html).

- naap_lunar_phase.html:
In IALs,
find the comment ! Insert--lunar_phase.html------------------------------------------------>
The applet in the figure below (local link / general link: naap_lunar_phase.html) dynamically illustrates the lunar phases.

- naap_observer.html: In IALs,
find the comment ! Insert--naap_observer.html------------------------------------------------>
The horizontal coordinates are explained in the figure below (local link / general link: horizontal_coordinates.html) and applet in the figure below that (local link / general link: naap_observer.html).

- naap_intensity_orientation.html:
In IALs,
find the comment ! Insert--naap_intensity_orientation.html------------------------------------------------>
The orientation effect is illustrated in the two figures below (local link / general link: power_flux_area.html; local link / general link: naap_intensity_orientation.html).

- naap_planetary_configurations.html:
In IALs,
find the comment ! Insert--naap_configurations.html------------------------------------------------>
Planetary configurations are dynamically illustrated by the applet in the figure below (local link / general link: naap_planetary_configurations.html).

- naap_planetary_orbit_simulator.html:
In IALs,
find the comment ! Insert--naap_planetary_orbit_simulator.html------------------------------------------------>
- From IAL 2:
You can learn a lot about orbits in planetary systems by playing with the NAAP Applet: Planetary Orbit Simulator displayed in the figure below (local link / general link: naap_planetary_orbit_simulator.html) and looking at the Orbit videos below that (local link / general link: orbit_videos.html).

- From IAL 4:
The applet NAAP: Planetary Orbit Simulator in the figure below (local link / general link: naap_planetary_orbit_simulator.html) can be played with by students at their leisure in order to get a better grasp of Kepler's 3 laws of planetary motion.

- From IAL 2:
- naap_ptolemaic_system_simulator.html:
In IALs,
find the comment ! Insert--ptolemaic_system_simulator.html------------------------------------------------>
**The Applet for the Ptolemaic System:**Student's are urged play with the NAAP Applet: Ptolemaic System Simulator in the figure below (local link / general link: naap_ptolemaic_system_simulator.html) to get a better understanding of the Ptolemaic system.

- naap_radial_velocity_simulator.html
- naap_seasons.html:
In IALs,
find the comment ! Insert--naap_seasons.html------------------------------------------------>
**The Seasons Summarized:**The seasons are summarized in the applet in the figure below (local link / general link: naap_seasons.html). The reader should play around with it and push all the buttons.

- naap_sky_explorer.html:
In IALs,
find the comment ! Insert--naap_sky_explorer.html------------------------------------------------>
**Two Perspectives on the Celestial Sphere in an Applet:**The applet in the figure below (local link / general link: naap_rotating_sky_explorer.html) allows one to explore the celestial sphere from the two perspectives:

- The perspective with the Earth
seen as an infinite plane cutting the
celestial sphere in half and
a rotating celestial sphere.
- The perspective with a rotating Earth
as a pinprick at the center of the celestial sphere---well
you have to imagine the Earth as a pinprick since for diagramatic
reasons its shown as pretty big compared to the
celestial sphere.

- The perspective with the Earth
seen as an infinite plane cutting the
celestial sphere in half and
a rotating celestial sphere.

- naap_supernovae.html
- naap_zodiac.html:
In IALs,
find the comment ! Insert--naap_zodiac.html------------------------------------------------>
The figure below
(local link /
general link: zodiac_ecliptic.html)
and
the applet in figure below that
(local link /
general link: naap_zodiac.html)
make the solar time advance clear.