CORE Chandrayaan-3 and Aditya-L1 — India's lunar south-pole landing and first solar observatory
Chandrayaan-3 turned India's 2023 lunar campaign into a systems demonstration rather than a symbolic flyby. Launched on 14 July 2023 aboard LVM3-M4 from Sriharikota, it aimed for the south-polar descent window of 2023-08-23 after propulsion-module separation on 5 August 2023. Its core stack paired the Vikram lander with the Pragyan rover, while the Chandrayaan-2 orbiter continued as the communication relay, so no new orbiter had to duplicate an already working function. That design choice mattered because it concentrated mass, guidance, and mission risk on landing and rover operations.
At 18:04 IST on 2023-08-23, India completed a soft landing in the lunar south-polar region at 69.37°S 32.35°E. The landing site was later named Shiv Shakti Point. This made India the 4th nation, after the United States, the Soviet Union, and China, to achieve a lunar soft landing, and the 1st nation to do so near the lunar south pole. The event immediately moved from mission success to national memory, and 23 August was later adopted as National Space Day. In strategic terms, the landing showed that India could manage throttle control, hazard-avoidance logic, and final-descent stability in a high-latitude zone that future polar exploration will continue to value.
Pragyan then converted the landing into surface science. The six-wheeled rover, weighing about 26 kg, rolled out from the ramp, traversed about 100 m, and ran two compact instruments: APXS and LIBS. Their readings confirmed sulphur in the south-polar regolith and identified other elements such as aluminium, calcium, iron, chromium, titanium, manganese, silicon, and oxygen. That is why Chandrayaan-3 is not remembered only for touchdown imagery; it also proved that a small rover could generate usable geochemical evidence in a region that had not previously hosted a successful landed mission.
Aditya-L1 extended the same systems discipline from the Moon to the Sun. Aditya-L1, India's first dedicated solar observatory, was launched from Sriharikota on 2023-09-02 at 11:50 IST aboard PSLV-C57. Instead of aiming at a low Earth orbit observatory, the mission was designed for the Sun-Earth L1 Lagrange region, where a spacecraft can maintain a stable solar-viewing geometry. After Earth-bound manoeuvres, trans-L1 cruise, and orbit correction, halo-orbit insertion was completed on January 6 2024 at about 16:00 IST, placing the spacecraft roughly 1.5 million km from Earth in the Sun-Earth direction. That vantage gives long-duration, nearly continuous observation of the Sun without repeated Earth occultation.
The observatory carries 7 payloads. VELC, the Visible Emission Line Coronagraph, is the lead remote-sensing instrument and was developed by the Indian Institute of Astrophysics, Bengaluru. Alongside it are SUIT, SoLEXS, HEL1OS, ASPEX, PAPA, and the magnetometer. Together they observe the corona, chromosphere, X-ray activity, solar wind particles, and magnetic field conditions, creating a linked chain for space-weather interpretation. Official IIA material also describes VELC as the technically most challenging payload on the mission, which explains why Aditya-L1 is significant not only as a launch milestone but also as a scientific-instrumentation milestone.
Rajasthan enters this story through the Physical Research Laboratory's solar-astronomy network. PRL's Udaipur Solar Observatory is in Udaipur on Fatehsagar Lake, while Mount Abu hosts PRL's separate infrared observatory; keeping those two facilities distinct is important. The Udaipur observatory's early island-station effort began in 1975, its published solar atlas covers observations from 1976 onward, and PRL's acknowledgement record names M.K. Vainu Bappu among those who helped start the observatory. That ground-based tradition supports the interpretation of Aditya-L1 data because long-running chromospheric and coronal observations from Rajasthan strengthen calibration, event comparison, and historical context. Taken together, Chandrayaan-3 and Aditya-L1 show how India paired a lunar south-pole landing with a first L1 solar observatory within the same mission cycle.